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김우식,염경호,이계영 연세대학교 산업기술연구소 1986 논문집 Vol.18 No.1
A Study on the extraction of uranium(VI) was perfomed through an immobilized liquid membrane containing D₂EHPA carrier. Hydrogen ion concentration was the most predominant factor in the extraction of uranium(VI) and the extraction efficiency reached the maximum value when pH's of the feed and product solution were 2.5 and 1.0 respectively. Another operation conditions were feed and carrier concentration. The flux was reached a limiting value at feed uranium(VI) concentrations higher than 200mg/ℓand was decreased with more 15 vol% carrier concentration.
감성제품 환경에서의 독자적인 디자인 개발 프로세스 연구
최명식,계영신 경희대학교 디자인연구원 2004 예술· 디자인학연구 Vol.7 No.1
디지털 시대에 있어서 디자인은 어떤 모습을 가져야 하는가 하는 것이 현 세대를 이끌어 가는 디자인에 관련된 사람들의 화두가 아닐까 생각한다. 본 연구는 첫째로 디자인의 초점이 누구에게 맞추어 질까 하는 환경의 분석에서부터 기존의 디자인을 분석하여 새로운 개선, 개발 점을 찾아내고 그것을 새로운 디자인에 어떻게 적용시킬 것인가에 대해 분석하였고 둘째로 GUI(Graphic User Interlace)를 디자인 개발 프로세스에 어떻게 접목시킬 것인가에 대해 연구하였다. 현재 여러 방면에서 연구가 진행되고 있으나 GUI와 디자인 개발 프로세스가 별개로 이루어지고 있다는 점에 주안점을 두어 연구를 진행하였다. 디지털 시대의 디자인 개발 프로세스는 단순히 프로세스에서 정지된 것이 아니라 소비자를 중심으로 진행되고 변화, 발전한다. 미래의 프로세스는 생산자를 위한 프로세스가 아닌 사용자, 디자이너 그리고 생산자가 함께 포함이 된 것이다. 또한 독자적인 프로세스는 그 결과물인 제품 뿐 아니라 디자인 프로세스 자체가 디자인이 될 수 있다는 것이다. 정형화 되어있지 않은 디자인 개발이 프로세스의 전반적인 이해를 통해 얻어진 독자적인 디자인 개발 프로세스는 새로운 시대를 위한 통합적이면서 유동성 있는 디자인 개발 프로세스가 될 수 있어야 한다. Everybody Interested in the future design that what kind of life style, form and color etc. do we have in the future. This study analysed two things that first of all. what is the most important things and how to apply and to develope each elements in design process. second thing is how to combine GUI design process in the main process. In these day, human interface is very important because digital product is not only two way communication system but also Human Computer Interaction system. GUI design process has been studying many ways but sometimes GUI design process is not included in main design process. This study focused on design process that future design process is included consumer, designer and producer. New design process is moving for consumer, designer and producer because it doesn't have any fixed form. In the future design has to have unique design process because which significant consumer's life style, designer's style and company image and technology etc. Unique design process presents itself through the products which means design process is also invisible product, kind of design, in a story line. Consumer enjoys and interested in product and its background. Unique design process should be flexible that to combine each elements. Metamorphose unique design process could be in a future design form.
쪽파[Allium ascalonicum L.] 재배기간 중 Diazinon, Iprodione 및 Chlorfenapyr의 잔류랑 변화
고광용,나은식,김성헌,김상준,장영희,이규승 충남대학교 농업과학연구소 2005 농업과학연구 Vol.32 No.2
In order to know the residual pattern of pesticides and predict to the degradation period until below MRL, we experimented diazinon, iprodinon and chlorfenapyr for shallot. They were the most detected pesticide in shallot by NAQS (National Agricultural product Quality management Service) survey. In this experiment, we sprayed those pesticides 15days before harvest and analyzed 0, 1, 2, 3, 5, 7, 10, 14 day sample to establish logical equation and to calculate DT_(50). During the cultivating period, the residue amount of diazinon was changed from 1.02 mg/kg (0 day) to 0.01 mg/kg (14 day), DT_(50) was 2.19 days, and iprodione was changed from 1.45 mg/kg (0 day) to 0.14 mg/kg (14 day), DT_(50) was 4.15 days, and chlorfenapyr was changed from 1.5 mg/kg (0 day) to 0.01 mg/kg (14 day), DT_(50) was 1.97 days. The DT_(50) of double amount in those pesticides, diazinon was 2.24 days, iprodione was 4.82 days, and chlorfenapyr was 2.24 days, respectively.
인공 산성비 용액 함침 및 경사평면법에 의한 옥외용 실리콘 고무의 열화 특성 평가
김정호,정규원,유영식,양계준,박용관 成均館大學校 科學技術硏究所 1999 論文集 Vol.50 No.1
We investigated the effect of acid rain on the surface aging, and resistance to tracking and erosion of silicone rubber materials : First, we measured the contact angle, SEM, EDX, and weight reduction to investigate the surface aging caused by immersion in the artificial acid rain solution. From the results of a series of experiments, we concluded that the acid rain attacked the base polymer of the surface, and lead to the depolymerization. Second, we adopted Inclined-Plane Method to measure the resistance to tracking and erosion of silicone rubber, and rather not observably affected the immersed specimen in the tracking resistance than in the erosion resistance.
Cu(II)-Lactic Acid와 Cu(II)-LMWS-Chitosan 착물의 DFP 가수분해반응 연구
계영식 ( Young-sik Kye ),정근홍 ( Keunhong Jeong ),김동욱 ( Dongwook Kim ) 한국공업화학회 2020 공업화학 Vol.31 No.5
Lactic acid와 키토산을 Cu(II) 이온과 반응시켜 합성한 착물을 사용하여 유기인 유사 독성물질인 DFP (Diisopropyl fluorophosphate)분해반응에 적용하였다. Cu(II)-lactic acid 착물의 경우 homogeneous 상태에서 분해반응 반감기가 37. 1 min으로 분해성능이 우수하였다. 1 kDa 저분자량 수용성 키토산으로 합성한 Cu(II)-LMWS chitosan 착물은 결정화 후에는 용해도가 낮아 heterogeneous 한 상태에서 분해반응이 진행되었으며 그 반감기는 32.9 h이었다. 이 결과는 기존에 연구된 18 kDa 키토산 Cu(II)착물의 분해반응속도보다 약 16배 정도 증가된 것이다. Cu(II)-LMWS chitosan 착물을 결정화하지 않고 homogeneous한 상태로 진행한 분해반응에서는 반감기가 8.75 h로 용해도에 따라 약 4배의 차이를 확인할 수 있었다. DFP (diisopropyl fluorophosphate). Under the homogeneous reaction condition, Cu(II)-lactic acid chelate hydrolyzed DFP withthe half life time of 37.1 min. Cu(II)-LMWS chitosan chelate was synthesized with 1 kDa molecular weight of chitosan,which showed low solubility, and then crystallized. The half life time for hydrolyzing DFP using Cu(II)-LMWS chitosan was32.9 h indicating that the reaction rate is enhanced as much as 16 times more than that of using 18 kDa chitosan-Cu(II)complex. Under the homogeneous reaction condition, the half life time of Cu(II)-LMWS chitosan was 8.75 h. Therefore, wefound out that the solubility of Cu(II)-LMWS chitosan makes the difference in the reaction rate as much as 4 times.
( Young Joon Hong ),( Myung Ho Jeong ),( Yun Ha Choi ),( Eun Hye Ma ),( Jum Suk Ko ),( Min Goo Lee ),( Keun Ho Park ),( Doo Sun Sim ),( Nam Sik Yoon ),( Hyun Ju Youn ),( Kye Hun Kim ),( Hyung Wook Par 대한내과학회 2010 The Korean Journal of Internal Medicine Vol.25 No.4
Background/Aims: The aim of this study was to assess the effects of a usual dose of simvastatin (20 mg/day) on plaque regression and vascular remodeling at the peri-stent reference segments after bare-metal stent implantation. Methods: We retrospectively investigated serial intravascular ultrasound (IVUS) findings in 380 peri-stent reference segments (184 proximal and 196 distal to the stent) in 196 patients (simvastatin group, n = 132 vs. nonstatin group, n = 64). Quantitative volumetric IVUS analysis was performed in 5-mm vessel segments proximal and distal to the stent. Results: IVUS follow-up was performed at a mean of 9.4 months after stenting (range, 5 to 19 months). No significant differences were observed in the changes in mean plaque plus media (P&M) area, mean lumen area, and mean external elastic membrane (EEM) area from post-stenting to follow-up at both proximal and distal edges between the simvastatin and non-statin group. Although lumen loss within the first 3 mm from each stent edge was primarily due to an increase in P&M area rather than a change in EEM area, and lumen loss beyond 3 mm from each stent edge was due to a combination of increased P&M area and decreased EEM area, no significant differences in changes were observed in P&M, EEM, and lumen area at every 1-mm subsegment between the simvastatin and non-statin group. Conclusions: A usual dose of simvastatin does not inhibit plaque progression and lumen loss and does not affect vascular remodeling in peri-stent reference segments in patients undergoing bare-metal stent implantation. (Korean J Intern Med 2010;25:356-363)
A Proton Beam Irradiation Method for a Uniform Dose Distribution over a Sample Volume
Young Kyung Lim,Kye Ryung Kim,Bum Sik Park,Seok Ki Lee,Tae Gun Yang 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.4
We devised a proton beam irradiation method to obtain a uniform dose distribution over a sample volume with a range-modulating propeller and a rotatable sample stage. The range-modulating propeller and the rotatable sample stage were developed to achieve uniform longitudinal and transverse dose distributions in the sample, respectively. The functions of both devices were combined together under an appropriate working condition. The measured dose distributions had a uniformity above 90 % over a 16-cm-diameter, 10-mm-thick water-equivalent sample.