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전해액 중 Sodium silicate의 농도에 따라 양극 산화된 AZ31B 마그네슘 합금 양극 피막의 특성 평가
이동길(Dong-Kil Lee),김용환(Yong-Hwan Kim),박현(Hyun Park),정우창(Uoo-Chang Jung),정원섭(Won-Sub Chung) 한국표면공학회 2009 한국표면공학회지 Vol.42 No.3
Magnesium is one of the lightest metals, and magnesium alloys have excellent physical and mechanical properties such as high stiffness/weight ratios, good castability, good vibration and shock absorption. However their poor corrosion resistance, wear resistance, hardness and so on, have limited their application. To improve these defects, many techniques are developed. Micro arc oxidation(MAO) is a one of the surface treatments under anodic oxidation in which ceramic coating is directly formed on the surface of magnesium alloy. In this study, the characteristics of anodic film were examined after coating the AZ31B magnesium alloy through the MAO process. MAO was carried out in potassium hydroxide, potassium fluoride, and various concentration of sodium silicate in electrolyte. The morphology and chemical composition of the coating layer were characterized by SEM, XRD, EPMA and EDS. The hardness of anodic films was measured by micro-vickers hardness tester. As a result, the morphology and composition of anodic film were changed by concentration of sodium silicate. Thickness and Si composition of anodic film was increased with increasing concentration of sodium silicate in electrolyte. The hardness of anodic film was highly increased when the concentration of sodium silicate was above 40 g/l in electrolyte.
Truncated DCPC를 이용한 저배율 태양광 모듈 개발
이동길(Dong Kil Lee),김양규(Yang Gyu Kim),이광훈(Kwang Hoon Lee),장원근(Won Gun Jang),박영식(Young Sik Park) 한국태양광발전학회 2013 Current Photovoltaic Research Vol.1 No.1
LCPV modules under 5 suns consist of reflective optics and receiver modules, similar to a typical fixed concentration PV module. If they are to be used as a compound parabolic concentrator, which is filled with a dielectric material, a compact plate structure of the fixed CPV can be designed and built at a large acceptance angle. These types of flat-plateμ-LCPV modules are suitable for building integrated photovoltaic modules, facade applications, mobile devices, and small home appliances. Therefore, in this study, the possibilities for other application devices were studied and presented by designing and fabricating LCPCs for CPV modules.
이동길(Dong-kil Lee),이학석(Hak-Suk Lee),김상석(Sang-Suk Kim),김혜정(Hye-Jung Kim),김정호(Jung-Ho Kim) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
Recently, due to the tremendous growth of media technology, demands of the aspheric glass lens which is a high-performance and miniaturized increase gradually. Generally, the aspheric glass lens is manufactured by GMP(Glass Molding Press) method using WC(tungsten carbide) mold core. In this study, the shrinkage which was occurred by GMP process was analyzed and applied it to compensate the aspheric glass lens. The compensated lens was satisfied that can be applied to the actual specifications
이동길(Dong-Kil Lee),이진영(Jin-Young Lee) 대한자원환경지질학회 2021 자원환경지질 Vol.54 No.5
골재는 주택 및 도로·항만 등과 같은 SOC건설에 사용되는 주요한 천연자원이며 국가건설의 기본이 되는 기초자재이다. 골재가 공사원가에서 차지하는 비중은 약 4%에 불과하나, 골재는 건설공사 용적의 약 80%를 점유함으로서 건설공사의 양과 질을 좌우하는 필수요소이다. 하천, 수중, 하상, 바다, 육상 골재는 생산시 환경 문제와 제한된 부존량으로 인해 골재수급에 어려움이 발생할 경우 골재의 생산량을 급격하게 증가시키기 어려운 반면에 산림골재는 증산이 비교적 용이하다. 산림골재는 부존량이 풍부해 향후 다른 골재 감축시 대체 골재자원으로 유망하게 평가받고 있으며, 잘 짜여진 계획과 정책에 따라 골재수요에 유연하게 대응할 수 있는 효과적인 골재재원이다. 본 연구에서는 산림골재 개발에 큰 영향을 미치는 운반거리를 중심으로, 운반거리가 긴 경우와 짧은 경우에 대해서 산림골재 활성화 방안과 더불어 현재 산림골재 개발의 난제에 대한 대책을 제시하였다. Aggregate is a major natural resource used in SOC construction, such as housing, roads, ports, etc., and is a fundamental material for national construction. Although aggregates account for only about 4% of the construction cost, aggregates occupy about 80% of the construction volume and are essential factors that determine the quantity and quality of buildings. For river, underwater, riverbed, sea, and land aggregates, it is difficult to rapidly increase the production of aggregates when there is difficulty in supply and demand due to environmental problems and limited resources during production, whereas forest aggregates are relatively easy to increase production. Forest aggregates are considered promising as alternative aggregate resources in the future when reducing other aggregates due to their abundance of natural resources, and are an effective aggregate source that can flexibly respond to aggregate demand in accordance with well-organized plans and policies. This study proposed the plan for activating the development of forest aggregates in the case of long and short transport distances, which is a factor that has a great influence on the development, and measures for the current difficulties in forest aggregate development.
상피성 난소암세포에서 이소플라본 유도체 NV-196의 세포고사 유도 효과
서동수 ( Dong Soo Suh ),주종길 ( Jong Kil Joo ),김승철 ( Seung Chul Kim ),이동형 ( Dong Hyung Lee ),이우희 ( Woo Hee Yi ),윤만수 ( Man Soo Yoon ),김기형 ( Ki Hyung Kim ) 대한산부인과학회 2011 Obstetrics & Gynecology Science Vol.54 No.2
목적: 상피성 난소암세포(CP70, R182)에서 합성 이소플라본 유도체인 NV-196의 세포고사 유도효과를 조사하고, 이들 항암제에 내성을 보이 는 난소암세포에서 NV-196을 전처치하였을 때 세포고사 효과의 증강이 있는지를 알아보고자 하였다. 연구방법: 상피성 난소암세포인 CP70 세포와 R182 세포를 NV-196의 0.1, 1, 10 μg/mL의 농도로 24시간, 48시간 동안 치료하였다. 세포생존율은 CellTiter 96 AQueous One Solution Cell Proliferation Assay를 통해서, caspase 활성도는 Caspase-Glo assay를 이용하였다. 세포고사 경로의 확인을 위해 XIAP, caspase-2, Bid의 활성화는 western blot 분석을 하였다. 결과: NV-196은 CP70 세포와 R182 세포에서 모두에서 치료시간과 치료농도에 비례하여 세포생존율을 효과적으로 감소시켰다. 두 세포 모두에서 caspase-3의 유의한 상승이 관찰되어 세포고사에 의한 세포생존율의 감소임을 알 수 있었다. Caspase-8와 caspase-9도 양 세포에서 caspase-3의 증가와 유사한 양상을 보였다. Western blot 분석에서 XIAP의 불활성화와 caspase-2와 Bid의 활성화를 관찰하였다. 10 μg/mL NV-196을 8시간 동안 전처치하였을 때 CP70 세포와 R182 세포 모두에서 카보플라틴 또는 파클리탁셀로 치료하였을 때 세포생존율의 유의한 감소가 있었다. 결론: NV-196은 세포고사를 통해 유의한 세포생존율의 감소를 유도하였다. NV-196의 전처치는 난소암세포를 카보플라틴이나 파클리탁셀에 민감하게 만들어 항암제내성을 개선할 수 있을 것으로 기대된다. Objective: The objectives of this study were to determine the efficacy of NV-196, a synthetic isoflavone derivative, as a chemosensitizer in chemoresistant CP70 and R182 epithelial ovarian cancer (EOC) cells and to characterize the mechanism behind its sensitizing effect. Methods: EOC cells were treated with tenfold dilutions of NV-196 (0.1 to 10 μg/mL) for 24 and 48 hours. Cell viability was determined by the CellTiter 96 AQueous One Solution Cell Proliferation Assay. Apoptosis was assessed by Caspase-Glo assays and apoptotic cascade X-linked inhibitor of apoptosis protein (XIAP), caspase-2 and Bid were characterized by Western blot analyses. Results: As a monotherapy, NV-196 showed decreased cell viability in a time- and dose-dependent manner in both CP70 and R182 cells. A significant increase in caspase-3 activity was observed in both cells. Caspase-8 and -9 activation were also observed. Western blots demonstrated Bid and caspase-2 activation and cleavage of XIAP. NV-196 enhances the cytotoxic effects of carboplatin and paclitaxel. Conclusion: NV-196 induces cell death through the induction of apoptosis. Pretreatment with NV-196 may sensitize the ovarian cancer cells to carboplatin or paclitaxel. NV-196 may act as a chemosensitizing agent in epithelial ovarian cancer cells.
수온 및 절식에 따른 넙치 (Paralichthys olivaceus) 근육의 물리화학적 특성 변화
심길보 ( Kil Bo Shim ),이소정 ( So Jeong Lee ),윤호동 ( Ho Dong Yoon ),임치원 ( Chi Won Lim ),신윤경 ( Yun Kyung Shin ),정민환 ( Min Hwan Jeong ),이동길 ( Dong Gil Lee ),박태일 ( Tae Ii Park ) 한국수산과학회(구 한국수산학회) 2012 한국수산과학회지 Vol.45 No.5
The effects of low temperature and starvation on the physiochemical characteristics of the muscle of the olive flounder Paralichthys olivaceus, were examined. Fish were deprived of feed for 28 days at 2, 4, 6, 8, 10, 12, and 20°C in order to establish suitable conditions for live fish transportation. Throughout most of the 4 weeks of feed restriction, the physiochemical characteristics of the muscle of olive flounder were found to be dependent on the acclimation temperature. The breaking strength of muscle did not show a significant reduction during feed restriction at 2 and 4°C. With increasing temperatures, however, the breaking strength of muscle differed significantly according to the individual and feed restriction period (P<0.05). The moisture content in muscle acclimated at 10, 12, and 20°C increased steadily over the feed-restriction period, while the crude lipid content decreased during the same period (P<0.05). At water temperatures above 2-8°C, no significant differences were shown during the same period. After it reached 6, 8, 10, 12, and 20°C, the muscle had an accumulation of lactate, and a loss of ATP. There was no change in the lactate or ATP content during the feed restriction period at 2 and 4°C, although there were differences among the water temperature groups, These results clearly show that temperature can have an important influence on the of muscle of physiochemical characteristics of muscle during live fish transportation.
Vanishing Line based Lane Detection for Augmented Reality-aided Driver Induction
Jeong-Rok Yun(윤정록),Dong-Kil Lee(이동길),Sung-Kuk Chun(전성국),Sung-Hoon Hong(홍성훈) 한국컴퓨터정보학회 2019 韓國컴퓨터情報學會論文誌 Vol.24 No.1
In this paper, we propose the augmented reality(AR) based driving navigation based on robust lane detection method to dynamic environment changes. The proposed technique uses the detected lane position as a marker which is a key element for enhancing driving information. We propose Symmetrical Local Threshold(SLT) algorithm which is able to robustly detect lane to dynamic illumination environment change such as shadows. In addition, by using Morphology operation and Connected Component Analysis(CCA) algorithm, it is possible to minimize noises in the image, and Region Of Interest(ROI) is defined through region division using a straight line passing through several vanishing points We also propose the augmented reality aided visualization method for Interchange(IC) and driving navigation using reference point detection based on the detected lane coordinates inside and outside the ROI. Validation experiments were carried out to assess the accuracy and robustness of the proposed system in vairous environment changes. The average accuracy of the proposed system in daytime, nighttime, rainy day, and cloudy day is 79.3% on 4600 images. The results of the proposed system for AR based IC and driving navigation were also presented. We are hopeful that the proposed research will open a new discussion on AR based driving navigation platforms, and thus, that such efforts will enrich the autonomous vehicle services in the near future.