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전기도금을 이용한 스테인레스 스틸 선재의 직경 증가에 관한 실험적 연구
조진형,성영은,이기헌,황현식 대한치과교정학회 2003 대한치과교정학회지 Vol.33 No.2
본 연구는 전기도금을 이용하여 교정용 선재의 직경을 증가시킨 후 그 물성 변화를 알아봄으로써 이의 임상적 적용 가능성을 알아보고자 시행되었다. 0.016 인치 스테인레스 스틸 교정용 선재에 전기도금을 위한 적절한 전처리를 시행한 후, 황상 니켈 100g/L, 염화니켈 60g/L, 붕산 30g/L, 염화나트륨 50g/L의 조성을 가지는 전해액을 제조하여 1.7V의 전압과 25∼29℃의 온도 3.1∼3.3pH의 조건 하에서 직경을 0.002 인치 증가시켜 0.018 인치 직경의 선재로 만들었다. 전기도금 과정 중 1분 단위로 직경을 측정하여 시간에 따른 직경 증가율을 구하였고, 도금 후 서로 다른 세 지점의 직경을 계측하여 균일성을 평가하였으며, 도금 금속의 정성분석을 위하여 X-선 회절감사를 시행하였다. 도금층의 밀착성 증진을 위해 400℃의 전기로에서 10분간 열처리를 시행한 후 도금 전후와 열처리 전후의 물성 변화를 알아보기 위하여 3점 굴곡 실험을 시행하여 다음과 같은 결과를 얻었다. 1. 전반적인 하중-변형을 곡선을 보면 0.016 인치 군과 0.018 인치 군 사이에 도금 처리한 군이 존재하였으며 열처리한 경우가 0.018 인치 군에 더욱 가까워지는 양상을 보였다. 2. 도금에 의해 직경은 0.002 인치 증가시킨 군이 기존의 0.016 인치 군에 비하여 강성과 항복상도, 극한강도 모두 증가하는 경향을 보였으며 이 중 강성과 극한 강도는 통계적인 유의한 차이를 보였다. 3. 0.016 인치에서 도금에 의해 직경을 0.002 인치 증가시킨 준이 기존의 0.018 인치 군보다 강성과 항복강도 극한강도 모두에서 낮게 나타났으며 통계적 유의차를 보았다. 4. 도금 후 열처리를 시행한 군이 시행하지 않은 군보다 강성, 항복강도, 극한강도 모두 높은 경향을 보였으며, 극한강도에서 유의한 차이를 나타내었다. 5. 전기도금 후 서로 다른 세 지점의 직경차이는 0.1∼0.3%로 균일하게 나타났으며 통계적으로도 유의차가 존재하지 않았다. The purpose of this study was to evaluate the possibile clinical application of electroplating to increase diameter of an orthodontic wire, through examining the change of physical properties. The diameter of stainless steel orthodontic wire was increased from 0.016 inch to 0.018 inch by electroplating in a bath of nickel sulfate 100g/L, nickel chloride 60g/L, boric acid 30g/L, and sodium chloride 50g/L, under the conditions of 1.7V, 25∼29℃, and 3.1∼3.3pH. During the electroplating, the rate of diameter increase was measured every minute. To investigate uniformity, the diameter was performed to analyze the nature of the electroplated metal. Following heat treatment to improve adhesion between the wire and electroplated metal, a three-point bending test was conducted to compare stiffness, yield strength, and ultimate strength among four wire groups; 0.016 inch, electroplated 016, electroplated and heat-treated 016, and 0.018 inch wires. Through the comparison of each wire group, following results were obtained. 1. In the load-deflection graph, the curve of the electroplated group was places between that of the 0.016 inch group and the 0.018 inch group, and the curve was closer to the 0.018 inch group by heat treatment. 2. In the electroplated and heat-treated 016 wire group, the values of stiffness, yield strength and ultimate strength showed higher tendency than in the original 0.016 inch group. Stiffness and ultimate strength showed statistically significant differences between two groups. 3. Stiffness, yield strength, and ultimate strength of electroplated wire presented lower values than those of 0.018 inch wire group. 4. Stiffness, yield strength, and ultimate strength of electroplated and heat-treated wire showed higher tendency than those of electroplated wire group, and ultimate strength showed statistically significant difference between two groups. 5. After electroplating, the difference in diameter between the three locations was within 0.1∼0.3% variation, and showed no statistical significance.
조진형,김수빈,류두진 금융감독원 2021 금융감독연구 Vol.8 No.2
This study analyzes the problem of the voice phishing alert system by examining the existing voice phishing joint alert system. Due to the nature of voice phishing, there are lots of related agencies, making it difficult to issue a rapid alert. FSS's consumer alert is desirable as a voice phishing alert system, given that it has been continuously improved and implemented compared to other alerts. In order to enhance the effectiveness of consumer alerts, we introduced the expansion of the operation method and the issuance route by sector, customized alert texts using AI and big data, simplification of delivery contents and provision of additional information considering the characteristics of consumers considering involvement. Through this, it is expected that the consumer alert will overcome the limitation of the existing voice phishing alert system.
조진형 금융감독원 2020 금융감독연구 Vol.7 No.2
본 연구는 최근 금융소비자보호법(안)이 국회 정무위원회를 통과하면서 제정가능성이 높아진 상황에서우리나라 금융감독체계 하에서 논의 중인 주요 쟁점(집단소송제도, 징벌적 손해배상 등)에 대해 법경제학적 분석을 통해 남소가능성 등 발생할 수 있는 문제점을 살펴보고 개선방안을 제안한다. 금융소비자보호법(안)의 집단소송제도, 입증책임전환 등 주요 쟁점은 금융소비자의 권리구제에 도움이 될 수 있으나금융산업의 안정성을 저해할 수 있다는 점에서 신중한 접근이 필요하다. 분석 결과, 집단소송제도로 인한 무분별한 제소의 가능성은 낮은 것으로 나타났으며 현 금융분쟁조정제도의 한계를 극복하기 위해 집단분쟁조정제도와 금융소비자보호처의 소익검토와 소송대리를 제시하였다. 이를 통해 집단소송제도가도입되지 않은 금융소비자보호법(안)의 한계를 극복하여 금융소비자의 사후적 권리구제가 한층 수월해질 것으로 예상한다.
A Diagnostic Method of Control-in/out in the Glass Furnace
조진형,이세재,장도수 한국산업경영시스템학회 2006 한국산업경영시스템학회지 Vol.29 No.1
The high degree of viscosity and the non-Newtonian fluid dynamics characterizes the process inside a glass furnace. Because the temperature is fluctuating in very short time-intervals, it is hard to determine that the status of its fluctuation is stable or unstable. Usually Shewhart-chart is used to determine the control status. However because of the characteristics of the temperature fluctuations in the glass furnace it does not directly serve the purpose here. Therefore we suggest using ARIMA to diagnose control status and confirm that the method using ARIMA can be a better tool than Shewhart-chart.
낙동강 하구역 퇴적물 중금속의 분포와 오염의 역사 추정
조진형,박남준,김기현,Cho, Jin-Hyung,Park, Nam-Joon,Kim, Kee-Hyun 한국해양학회 2000 바다 Vol.5 No.4
In order to determine the horizontal and vertical distributions of metals and prospect the recent metal pollution history in Nakdong Estuary, we took surface and core sediments. Maximum value of organic matter occurs at the upstream site located 4 km from Nakdong barrage, and the concentration of trace metals (Zn, Cu, and Pb etc.) decrease seaward in the estuary. The sedimentation rates, based on $^{210}$Pb$_{ex}$ and $^{137}$Cs activities, were 0.34 cm/yr in inside of barrage (core 1) and 0.25 cm/yr in Changrim (core 4). Sediment mixing layer does not exist in core 1, where anoxic condition is known to be prevail. The topmost sediment layer of core 4 (<3.5 cm) is severely mixed. At sites 1 and 4, concentrations of Cu slowly increased during the period of 1920-1970, rapidly increased during 1970-1990, and followed by slight decrease after 1990. Zn contents increased in early 1960s and peaked in 1993, and followed by decrease after 1990s. Pb has increased continuously since early 1970s. At the downstream of the barrage, Cu and Zn have increased in the topmost layer. The trend of increase of Cu is evident after 1950 (11 cm in sediment depth). Overall trend of heavy metal concentration clearly indicates the pollution has been increasing after the construction of the barrage.
Differential expression patterns of gangliosides in the tissues and cells of NIH-mini pig kidneys
조진형,장규태,김지수,이영춘,곽동훈,김원신,고기성,추영국,오건봉,황성수 한국통합생물학회 2010 Animal cells and systems Vol.14 No.2
Gangliosides are a ubiquitous component of the membranes of mammalian cells that have been suggested to play important roles in various cell functions such as cellcell interaction, adhesion, cell differentiation, growth control and signaling. However, the role that gangliosides play in the immune rejection response in xenotransplantation is not yet clearly understood. In this study, differential expression patterns of gangliosides in HEK293 (human embryonic kidney cells), PK15 (porcine kidney cells), NIH-kd (NIH-mini pig kidney cells, primary cultured) and the cortex, medulla and calyx of the NIH-mini pig kidney were investigated by high-performance thin-layer chromatography (HPTLC). The results revealed that HEK293, PK15 and NIH-kd contained GM3, GM2 and GD3 as major gangliosides. Moreover, GM3, which are the gangliosides of NIH-kd, were expressed at higher levels than HEK293 and PK15. Especially, GT1b were expressed in HEK293 and NIH-kd but not in PK15. Finally, GM1and GD1a were expressed in NIH-kd, but not in HEK293 or PK15. These results suggest that differential expression patterns of gangliosides from HEK293, PK15 and NIH-kd are related to the immune rejection response in xenotransplantation.