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개발도상국 문화재 도시에 대한 기후변화 재해 예방 - 베트남 후에시를 중심으로 -
이병재 국가유산방재학회 2021 문화재방재학회 논문집 Vol.6 No.1
This study examined the current status and vulnerability of climate change disasters, especially flood disasters in Hue City, Vietnam, one of the representative cultural heritage cities in developing countries, and analyzed the current state of climate change disaster prevention and the possibility of applying countermeasures. Through this, a method of preventing climate change disasters was sought while preserving the value and landscape of cultural heritage by utilizing urban planning measures.
2016년 미국 대선에 나타난 소수인종의 투표결과 분석: 라티노의 경우
이병재 한국사회역사학회 2018 담론 201 Vol.21 No.2
본 논문의 목적은 미국의 2016년 대통령 선거에 나타난 라티노의 클린턴 지지율이 실제로 2012년 오바마에 대한 지지율보다 낮았다는 주장을 검증하는 것이다. 출구조사결과와 실제 투표는 커다란 차이를 보이는 경우가 많은데, 이 문제는 특히 소수인종의 경우에 더욱 두드러진다. 왜냐하면 소수인종의 경우 특정 지역에 밀집되어 사는 경향이 있기 때문에 대표성을 가진 표본을 추출하기 어렵기 때문이다. 이러한 표본상의 문제점 때문에 출구조사는 여러 주에서 결과를 잘못 예측하기도 했다. 본 논문에서는 카운티별 집적데이터와 비모수적 통계기법을 사용하여 라티노 인구비율과 민주당의 대선후보 지지와의 관계를 고찰한다. 이를 통하여, 기존의 주장과 달리 라티노 인구비율과 클린턴 지지의 관계는 선형적이지 않으며, 2012년의 오바마에 대한 라티노 지지와 2016년 클린턴에 대한 라티노 지지에는 강도의 차이가 있었다는 것을 보여준다. 또한, 라티노의 민주당 지지와 투표율이 출구조사보다 높았다는 주장은 근거가 약하며, 이러한 주장은 라티노 인구가 많은 지역에서는 적용될 수 있지만, 그렇지 않은 지역에서는 검증되기 어렵다는 점을 보여준다. The purpose of this paper is to examine the controversial claim that Latino support for Clinton in the 2016 Presidential election was much lower than that for Obama in the 2012 Presidential Election. There are many instances in which exit poll results are quite different from the actual results, expecially in the case of minority population. This discrepancy is primarily due to the fact the minority groups tend to live in concentrated areas (cities), and hence, they tend to be under-represented in survey samples. This problem was highlighted in the 2016 US presidential election, in which the results of the some states were even reversed later. This paper shows that the relationship between the support for Democratic candidate and Latino population is not linear and that the claim that Latinos actually supported Democratic candidate more than the exit poll results are only partially correct. Using the county-level data from American Community Survey and election results, and non-parametric Generalized Additive Models (GAM), this paper shows that the support rate for Democratic presidential candidate tend to increase linearly in the areas with Latino population over 50%, which is not observed in the areas with low Latino population rates.
Air Pollution Exposure and Cardiovascular Disease
이병재,이규홍,김범석 한국독성학회 2014 Toxicological Research Vol.30 No.2
Ambient air pollution (AAP) and particulate matters (PM) have been closely associated with adverse health effects such as respiratory disease and cardiovascular diseases. Previous studies have examined the adverse health effects associated with short- and long-term exposure to AAP and outdoor PM on respiratory disease. However, the effect of PM size (PM2.5 and PM10) on cardiovascular disease has not been well studied. Thus, it remains unclear how the size of the inhalable particles (coarse, fine, or ultrafine) affects mortality and morbidity. Airborne PM concentrations are commonly used for ambient air quality management worldwide, owing to the known effects on cardiorespiratory health. In this article, we assess the relationshipbetween cardiovascular diseases and PM, with a particular focus on PM size. We discuss the association of PM2.5 and PM10, nitrogen dioxide (NO2), and elemental carbon with mortality and morbidity due to cardiovascular diseases, stroke, and altered blood pressure, based on epidemiological studies. In addition, we provide evidence that the adverse health effects of AAP and PM are more pronounced among the elderly, children, and people with preexisting cardiovascular and respiratory conditions. Finally, we critically summarize the literature pertaining to cardiovascular diseases, including atherosclerosis and stroke, and introduce potential studies to better understand the health significance of AAP and PM on cardiovascular disease.
Sulfur Polymer Emulsion을 활용한 반강성 포장용 시멘트 주입재의 특성
이병재,이준,현정환,김윤용 한국구조물진단유지관리공학회 2013 한국구조물진단유지관리공학회 논문집 Vol.17 No.4
the desulphurization process. To exploit this abundance, the applications of sulphur must be expanded. as excellent durability of reuse of leftover sulphur which has high potential for utilization in construction materials, the study is actively in progress. Meanwhile, there has been active research on semi-rigid pavements that draw on the strengths and overcome the weaknesses of asphalt and concrete pavements. Acrylate is used to prevent cracking but involves a high cost, thus, an alternative material is required. As such, this study presents methods on the reuse of leftover sulphur and examines the engineering performance of grout containing sulfur polymer emulsion (SPE) for use in semi-rigid pavements. Our analysis shows that grout in which 30% of acrylate is replaced with SPE has superior properties in terms of time of flow and strength compared to regular grout. However, performance declined when more than 50% of acrylate was replaced by SPE, indicating that the optimum replacement level is 30%. Through SEM analysis, we found that grout with utra harding cement in this study at three hours had similar hydration properties to that of Type 1 Ordinary Portland Cement (OPC) at seven days, and maintained the properties regardless of grout containing SPE. OPC and grout with a replacement level of 30% displayed similar levels of chloride invasion resistance, whereas grout without SPE was far less resistant. Within the scope of this paper, the optimum replacement level of acrylate with SPE was found to be 30% in consideration of various properties such as time of flow, strength, and chloride invasion resistance.
자발적 균열치유작용 최적화를 위한 미생물군 분리 및 균열치유작용 검증
이병재,유연준,이효섭,양주경,이윤 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 논문집 Vol.27 No.1
In this study, basic research was conducted to secure microbial resources applicable to autonomous crack healing concrete. To this end, inthis experiment, biomineral-forming microorganisms were separated from natural sources, and the ability of survival in cement and calcium carbonateprecipitation were compared to secure suitable microbial resources. Bacillus-type bacteria forming endospores were isolated from the sample, and theamount of calcium carbonate produced by the six microorganisms identified by 16S rRNA sequencing was compared. Two types of microorganisms,Bacillus velezensis and Bacillus subtilis, with the highest calcium carbonate precipitation were selected, and the survival of the microorganisms wasconfirmed through phase contrast microscopy after being cured after being added to the mortar. In addition, it was confirmed that the autonomouscrack healing capability by the crack healing material produced by microorganisms was confirmed by artificially generating cracks in the mortar. 이 연구에서는 자발적 균열 치유 콘크리트에 적용할 수 있는 미생물자원을 확보하기 위한 기초 연구를 수행하였다. 이를 위해 본 실험에서는 생체광물 형성 미생물을 시료에서 분리하고 시멘트 내부 생존 및 탄산칼슘 석출량을 비교하여 적합한 미생물자원을 확보하였다. 시료에서 내생포자(endospore)를 형성하는 Bacillus 계열의 박테리아를 분리하여 16S rRNA 염기서열 분석법으로 동정한 6종의 미생물이 생성하는 탄산칼슘 석출량을 비교하였다. 탄산칼슘 석출량이 가장 많은 Bacillus velezensis와 Bacillus subtilis의 2종의 미생물을 선별하였고, 모르타르에 첨가 후 양생하여 위상차 현미경 관찰을 통해 미생물의 생존을 확인하였다. 또한 모르타르에 인위적 균열을 발생시켜 미생물에 의해 생성된 균열치유물질에 의한 자발적 균열 치유 작용을 확인할 수 있었다.