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중간문과 조우(遭遇) 파자구(把字句) ― 중간태와 태 전환 현상에 관한 소고
조경환 ( Cho Kyunghwan ) 중국어문연구회 2018 中國語文論叢 Vol.0 No.86
In this paper, we investigated middle construction and encounter baconstruction. The middle construction is the construction of the voice in the middle between passive voice and active voice, while encounter ba-construction is the construction in the middle stage between the disposal(active) and the causative(zhishi). First of all, when we look at the commonality between the two constructions, the agent is implied and not remarkable, so that these construction has the meaning of ‘unexpectedness’. This is related to the background or deletion of the agent, and thus the change of the transitive verb (from two valency to one valency) is also common. Next, the deletion of subject is also similar. Especially, in case of the middle construction in Chinese, unlike English, subject can be frequently omitted. Despite these commonalities, there is also a clear distinction between these two constructions. First, the subject of the middle construction is responsible for the occurrence of the event, while the subject of encounter ba-construction is often omitted, or even if it is, only serves as a position reference point for the Ba-NP. Second, the agent of the middle construction is implied and generic, but in the encounter ba-construction it is completely omitted. Third, aspect markers don’t appear in the middle construction, while these aspect markers, especially ‘le’ appears frequently in encounter ba-contruction.
조경환 ( Kyoung-hwan Cho ) 한국고등직업교육학회 2000 한국고등직업교육학회논문집 Vol.1 No.4
The introduction of the Internet, a revolutionizing tool, has made the network be now being a part of our daily life. Managing and operating the network demands a new kind of vocational job, but there is no systematic curricula available in the technical schooling system (technical high school, technical college) to meet the requirement and the expectation from IT industry. The primary purpose of this study is to introduce the planning and developing process of the educational curriculum that will fulfill the requirements of IT industry.
조경환 ( Kyoung-hwan Cho ) 한국고등직업교육학회 2000 한국고등직업교육학회 학술대회 논문집 Vol.2000 No.8
The introduction of the Internet, a revolutionizing tool, has made the network be now being a part of our daily life. Managing and operating the network demands a new kind of vocational job, but there is no systematic curricula available in the technical schooling system (technical high school, technical college) to meet the requirement and the expectation from IT industry. The primary purpose of this study is to introduce the planning and developing process of the educational curriculum that will fulfill the requirements of IT industry.
차체 경량화를 위한 Al7075-T6와 SPFC590DP 이종소재 접합 공법에 따른 접합부 성능 비교 연구
조경환(Keong Hwan Cho),주진혁(Jin Hyeok Joo),이정흠(Jung Heum Lee),오제훈(Je Hoon Oh),감동혁(Dong Hyuck Kam) 대한용접·접합학회 2021 대한용접·접합학회지 Vol.39 No.5
The necessity of dissimilar joining between aluminum alloy and steel is increasing in order to meet the demand for weight reduction in automobiles. However, dissimilar joining between 7000 series aluminum alloy and steel is challenging with mechanical joining methods such as self-piercing rivet(SPR) and flow drill screw(FDS) without hole processing. In this study, mechanical performances of dissimilar joints between 3 mm thick Al7075-T6 and 1 ㎜ thick SPFC590DP were evaluated for use in lightweight B-pillar assembly. Self-Piercing Rivet(SPR) and Flow Drill Screw(FDS) with one-hole processing, bolt/nut and blind rivet with two-hole processing and adhesive bonding were compared with respect to joint performance. In SPR joining, rivet did not penetrate and rivet buckling occurred in the rivet due to the thickness and high strength of the Al7075-T6. By processing pre-hole on Al7075-T6 and applying an additional Al5052-H32 sheet to induce mechanical interlock in SPR joint, it became possible to join Al7075-T6 to SPFC590DP with an SPR. The tensile shear load of the SPR joint was 9.8 kN. In FDS joining, it is also necessary to process pre-hole on Al7075-T6 since the fastener could not penetrate the Al7075-T6. The tensile shear load of the FDS joining was 8.1 kN. In bolt/nut and blind rivet joining, the tensile shear load were measured respectively 11.1 kN and 5.2 kN. In adhesive bonding with 1K glue, the tensile shear load was measured 18.5 kN when the interfacial surface was roughened with a sand paper.
신경세포 분화와 산화스트레스에서 추출 조건에 따른 가물치 추출물의 효과
조경환 ( Kyoung Hwan Cho ),하영술 ( Young-sool Hah ),김은지 ( Eun-ji Kim ),이승준 ( Seung-jun Lee ),추호진 ( Ho Jin Choo ),강영미 ( Young Mi Kang ),김종철 ( Jong Cheol Kim ),손용휘 ( Yong Hwi Son ),이연지 ( Yeon Jee Lee ),조재윤 ( 한국산업식품공학회 2021 산업 식품공학 Vol.25 No.3
본 연구에서는 가물치(Channa argus) 추출물의 신경세포 분화와 산화 스트레스에서의 효능을 분석하기 위하여 녹차와 효소를 이용한 다양한 추출 방법(상온 추출물, RE; 녹차 상온 추출물, GRE; 효소 상온 추출물, ERE; 녹차 효소상온 추출물, GERE)을 사용하여 제조 된 추출물의 아미노산 조성과 항산화 활성을 비교 분석하였고, 신경성장인자(NGF) 유도 신경세포 분화 및 과산화수소 처리에 의해 유도된 PC12 세포 독성에 대한 보호효과를 규명하고자 하였다. 총 아미노산 함량은 RE 및 GRE보다 효소 추출물인 ERE 및 GERE에서 훨씬 더 높았다. 효소 가수 분해물 (ERE 및 GERE)에서 ABTS 라디칼 소거 활성은 RE 및 GRE보다 높았다. 또한, RE와 ERE는 PC12 세포에서 neuronal growth factor (NGF) 매개 신경 돌기 성장뿐만 아니라 growth associated protein (GAP)-43 및 synapsin-1의 발현을 현저하게 향상 시켰다. 과산화수소(H<sub>2</sub>O<sub>2</sub>)에 의해 손상된 PC12 세포에 4가지 유형의 Channa argus 추출물을 첨가 한 후 PC12 세포의 생존율을 측정하였다. PC12 세포의 생존율은 RE, GRE, GERE에서 각각 77.5±1.9%, 84.0±0.8%, 81.1±0.9%이였다. 이러한 세포 생존율은 H<sub>2</sub>O<sub>2</sub> 만을 처리 한 음성 대조군(70.0±2.0%)에 비해 더 높았다. H2O2 처리에 의해 유도 된 세포 독성도 RE, GRE 및 GERE 처리에 대한 반응으로 상당히 완화되었다. 종합하면, Channa argus 추출물은 산화 스트레스와 신경 손상을 감소시키는 기능성 물질로 유용하다는 것을 시사하며, 향후 이들 소재를 활용한 다양한 기능성 제품의 개발이 필요할 것으로 판단된다. The present study provides in vitro evaluations of snakehead (Channa argus) extracts on neuronal cell differentiation and oxidative stress. This study was conducted to analyze the constituents of the extracts prepared using different extraction methods (room temperature extract, RE; green tea room temperature extract, GRE; enzyme room temperature extract, ERE; green tea enzyme room temperature extract, GERE) and to compare their biochemical properties. The contents of total amino acids in ERE and GERE were much higher than RE and GRE from Channa argus. ABTS radical scavenging activities in enzymatic hydrolysates (ERE and GERE) were higher than those of RE and GRE. In addition, RE and ERE caused a marked enhancement of the nerve growth factor-mediated neurite outgrowth from PC12 cells and the expressions of growth-associated protein (GAP)-43 and synapsin-1. Four types of Channa argus extract were added to PC12 cells damaged by hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>), after which the survival rate of PC12 cells was measured. The survival rates of PC12 cells were 77.5±1.9%, 84.0±0.8%, 70.4±1.5%, and 81.1±0.9% at RE, GRE, ERE, and GERE, respectively. These cell survival rates were higher than that of the negative control group (70.0±2.0%) treated only with H<sub>2</sub>O<sub>2</sub>. Cellular toxicities induced by treatment with H<sub>2</sub>O<sub>2</sub> were also significantly alleviated in response to treatment with RE, GRE, and GERE. Taken together, these results suggest that Channa argus extracts are helpful as a functional material to decrease oxidative stress and neuronal damage.