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RC 보의 프리텐션 보강 효과 검증을 위한 실험체 설계 및 제작
서동우 ( Seo¸ Dong-woo ),정규산 ( Jung¸ Kyu-san ),김건수 ( Kim¸ Kun-soo ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.2
본 연구는 기존 포스트텐션(외부강선) 공법이 갖는 문제점(예: 정착구 힘의 집중, 외부 돌출된 보강재의 지속적인 관리 등)들을 극복하고 보다 발전된 구조형식을 적용하고자 하였다. 노후화된 콘크리트 구조물을 대상으로 긴장재의 프리텐션을 이용하여 보수·보강이 동시에 가능하며, 우수한 미관을 제공하는 신개념의 시공 기술을 개발하고 성능을 평가하고자 한다. 본 기술은 기존 유지관리 공법들이 갖는 한계와 문제점을 극복하고 보다 효율적인 구조물 성능향상 공법을 개발하고자 한다. 또한, 본 기술은 노후된 콘크리트 거더교를 주 보강 대상으로 하지만, 인장 또는 전단균열이 발생한 벽체와 곡선 표면을 가진 콘크리트 구조물 등 대부분의 노후 콘크리트 보강에 적용 가능하고, 보강성능도 우수할 것으로 예상된다.
Specificational Pseudoclefts and a Negative Sensitive Item Connectivity Effect
Dongwoo Park(Dongwoo Park) 한국생성문법학회 2023 생성문법연구 Vol.33 No.1
A negative sensitive item (NSI) connectivity effect shown in specificational pseudoclefts refers to a phenomenon where the NSI pivot can be licensed by the negation marker in the presupposition CP, even though the pivot is not in the scope of the negation marker in narrow syntax. English specificational pseudoclefts exhibit this connectivity effect, while Korean ones do not. In this squib, I argue that this contrast is attributable to the difference in characteristics of NSIs between the two languages, and that the breakdown of the NSI connectivity effect in Korean is induced by the semantic/pragmatic requirements imposed on specificational pseudoclefts.
Heavy Metal Reduction and Solidification based on CO<sub>2</sub> Uptake using Hydroxide Solutions
( Dongwoo Kang ),( Juhee Son ),( Yunsung Yoo ),( Jinwon Park ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 한국폐기물자원순환학회 추계학술발표논문집 Vol.2019 No.-
A large amount of municipal solid waste (MSW) is produced daily due to the development of the industry and economy, most of which is utilized, incinerated, and deposited in landfills. In some developed nations in Europe, the utilization of MSW incineration (MSWI) ash as construction material has been studied because of its physical properties, which are similar to that of aggregate. Except for the utilization, most of the produced MSW is incinerated and deposited in landfills. However, landfills are not preferred in nations with confined land areas because they require a large area due to the MSW volume. To decrease the MSW volume, incineration can be used. However, problems occur with respect to the treatment of MSWI ashes. When MSWI ashes are buried, hazardous components, such as heavy metals and othermetal components, can leach out, resulting in groundwater pollution. Because the groundwater can flow over long distances, the environmental and biological problems are not limited to the land close to the landfill area. Hence, the MSWI ash must be stabilized. In this study, we discuss new methods that can be used to treat MSWI fly ashes withhigher heavy metal contents compared with MSWI bottom ashes. By adding 0.5 M ammonium, sodium, and potassium hydroxide solutions to the MSWI fly ash, the leaching of hazardous materials, including heavy metals and other metal cations, is induced. Subsequently, the characteristics of the solution, which has a high pH value, are utilized and a CO<sub>2</sub> uptake procedure is applied to fix the metal cations in the aqueous phase in solids for easier handling. Compared with conventional acid leaching, the heavy metals, which leach out of the MSWI fly ash, can be converted into solids by CO<sub>2</sub> uptake. Further handling is easier and additional wastewater processing is not required. To verify the methodology, the compositions of the untreated MSWI fly ash and MSWI fly ash treated with four types of leaching solution, that is, distilled water, 0.5 M sodium hydroxide aqueous solution, 0.5 M potassium hydroxide aqueous solution, and 0.5 M ammonium hydroxide solution, were analyzed. The heavy metal reduction characteristics were determined using supporting data obtained from different methods such as qualitative XRD and SEM analyses.
Carbon Dioxide Capture and High Purity Calcium Carbonate Production by Target Metal Separation
( Dongwoo Kang ),( Min-gu Lee ),( Yunsung Yoo ),( Jinwon Park ) 한국폐기물자원순환학회(구 한국폐기물학회) 2017 한국폐기물자원순환학회 추계학술발표논문집 Vol.2017 No.-
In this research, carbon dioxide is captured and chemically converted to high purity calcium carbonate salt which can be used for various industrial fields. Aqueous indirect inorganic carbonation methods were applied throughout the research and seawater-based industrial wastewater was utilized for metal ion supply. For CO<sub>2</sub> capture, representative alkanolamine absorbent solutions in 30 wt% concentration were used, that is, monoethanolamine (MEA), diethanolamine (DEA), and methyldiethanolamine (MDEA). For high purity metal ion separation, calcium ion contained in the seawater-based industrial waster was separated in the form of gypsum followed by the carbonation reaction to form high purity calcium carbonate salt. Consiering the final products and their economic cost, the cycle using MEA will be proper. However, if MDEA can be used, the amount of carbon dioxide capture capacity per cycle would be great. Also, conceptual continuous cycle which produces calcium carbonate and magnesium carbonate was suggested. This research may help the nations such as European nations or east asian countries like Korea and Japan where no adequate CO<sub>2</sub> storages exist and crust activities are in progress, if commercialized.
Dongwoo Kim,Jae-Yong Chun,Kyeong-Yeoll Lee 한국응용곤충학회 2015 한국응용곤충학회 학술대회논문집 Vol.2015 No.04
Root-lesion nematodes, Pratylenchus sp., are recognized as one of the most important plant parasitic nematodes. They infest various crop plants and cause severe root damages which lead to the yield loss of agricultural crops. There are 72 species recorded in the world, but 14 species in Korea. Soil samples were collected from chrysanthemum cultivars in various regions. Morphological and molecular diagnosis firstly recognized two species as Pratylenchus kumamotoensis and P. pseudocoffeae in Korea. Morphologically, P. kumamotoensis characterized by pharyngeal gland lobes overlapping with intestine dorsally. P. pseudocoffeae, which is similar with P. coffeae, but pharyngeal gland lobes are longer than P. coffeae. In molecular diagnosis, nucleotide sequences of D2-D3 region (700-800 bp) within 28S rDNA and ITS region including ITS1, 5.8S and ITS2 (700-1,000 bp) between 18S and 28S rDNA were determined from collected samples. NCBI database comparison of D2-D3 of P. kumamotoensis and P. pseudocoffeae were 99% similar with those of corresponding species, respectively. ITS of P. pseudocoffeae was 99% similar within species. ITS sequence of P. kumamotoensis was firstly determined in this study. Distribution of P. kumamotoensis was only reported in Japan but P. pseudocoffeae is present in Japan and USA. Here we firstly report the presence of these two species in Korea.
The Existence of Failed Agreement: Evidence from English List-Existentials
( Dongwoo Park ) 서강대학교 언어정보연구소 2019 언어와 정보 사회 Vol.36 No.-
This paper aims to propose a structure of English list-existentials, an understudied type of expletive there-constructions, and argue the existence of failed agreement, proposed by Preminger(2014), by using English list-existentials. These constructions exhibit the following properties: First, the copula is always realized as 3<sup>rd</sup> person singular forms regardless of whether post-verbal associates of there are singular or plural. Second, associates of there in constructions in question are not nominative but accusative. In order to capture these two properties shown in list-existentials, which are substantially different from indefinite existentials, I suggest that there are two types of unaccusative v, depending on whether it can assign case or not. v in list-existentials is the one with an ability to assign case, while v in indefinite existentials is not. Additionally, I argue that the associates in list-existentials, which have already received case from v, cannot be appropriate targets for Agree. Thus, uninterpretable φ-features on T always fail to be deleted. Nonetheless, list-existential sentences containing undeleted uninterpretable φ-features can be well-formed. This is impossible under Chomsky’s (2000) derivational time-bombs model, but possible under the failed agreement model, proposed by Preminger(2014). Given this, I conclude that failed agreement does exist in the grammar of English.