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MOCVD법에 의해 제조된 Fe₂O₃-TiO₂계 박막의 내식성과 광전류 응답 특성에 관한 연구
金顯洙,尹在弘,金明鎬,杉本克久,邊鷹善 國立 昌原大學校 産業技術硏究所 1998 産技硏論文集 Vol.12 No.-
Fe₂O₃-TiO₂ films were formed by MOCVD technique, and their corrosion resistance and photoelectrochemical property were examined in acidic, neutral and alkaline solutions. The corrosion resistance was examined by an anodic polarization test, and the photocurrent response by a photoelectrochemical polarization test. The photocurrent and quantum yield maximum of the films depend on the titanium cationic fraction(Xη) in the films. They decreased in the range of Xη=0.0-0.70, then increased in the range of Xη=0.70-0.95, and finally decreased in the range of Xη=0.91-1.0 with increasing Xηvalue. The increase in the photocurrent and quuantum yield maximum in the range of Xη=0.70-0.95 was attributed to the amorphous structure. Such a change in the photocurrent and quantum yield maximum was independent to the solution pH. The corrosion resistance of the films increased with increasing Xηvalue of the film in acidic, neutral and alkaline solutions. Therefore, the films with Xη=0370-0.95 can be concluded to have high photocurrent response and high corrosion resistance.
油腐加工 중의 기름의 性狀變化 및 油腐貯藏 중의 品質變化
李應昊,鄭淑鉉,金根淑,金喜衍 釜山水産大學校 1981 釜山水産大學 硏究報告 Vol.21 No.2
油腐 튀김過程중 튀김用 기름의 性狀變化를 作業時間 經過에 따라 工場規模로 檢討하고 油腐를 4가지 貯藏方法으로 貯藏하여 貯藏期間에 따른 品質 變化를 實驗한 結果는 다음과 같다. 1. 튀김用 기름의 性狀變化에 있어서 산값과 色調는 低溫튀김솥(110±10℃) 및 高溫튀김솥(200±10℃)의 기름의 경우 모든 作業時間에 따라 增加하였으며 특히 低溫튀김솥의 기름의 變化가 더 컸다. 2. 과산화물값과 TBA값은 低溫튀김솥의 기름의 경우 增加하다가 減少하였으며 高溫튀김솥의 경우는 變化가 거의 없었다. 3. 油腐에서 抽出한 기름의 性狀은 高溫튀김솥의 기름의 영향을 크게 받았다. 4. 貯藏方法에 따른 油腐의 品質變化에 있어서 常溫(26±2℃) 貯藏의 경우 包裝하지 않은 것이 包裝한 것보다 貯藏性이 높았으며 脂肪의 酸敗面에서 볼 때 包裝하지 않은 것은 60日程度 貯藏이 가능하였다. 5. 4±2℃에서 貯藏할 경우에는 貯藏 期間에 따른 脂肪의 酸敗는 적었지만 長期貯藏은 困難하였고 -20℃에서 貯藏할 경우에는 貯藏期間에 따른 品質의 變化가 거의 없었으며 貯藏性이 매우 좋았다.
Ruled Surface로 형성된 임펠러 블레이드 전용 CAD/CAM 시스템 개발 Ⅱ : 5-축 가공에 관한 연구 A Study on the 5-Axis Machining
조현덕,정대일,윤문철,최두선,신보성,이응숙,董玉革 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.3
This study is continuous with the study 1 (A Study on the Modeling) and the sample impeller of this study is defined by the modeling process of the exclusive CAD/CAM system developed in the study I. And, this study describes a method for the 5-axis machining of impeller blades formed by ruled surface. Therefore, the exclusive CAD/CAM system is the software for modeling and machining of impeller blades. By using the machining method suggested in this study, we could manufacture impeller blades on 5-axis CNC machining center and the machined impeller was very agreeable to the designed impeller. Thus, theories proposed in this study can be very useful for the 5-axis machining of impeller blades.
하현욱,한정호,이정석,송은향,김우정,김두응,최진영 건국대학교 의과학연구소 2000 건국의과학학술지 Vol.10 No.-
Pure primary medullary hemorrhage is a rare condition, which is characterized by ipsilateral hypoglossal nerve palsy and contralateral hemiparesis. The hemorrhage usually extended to medial and ventral medulla, these two characteristic signs distinguished from the classical presentation of Wallenberg's lateral medullary syndrome. A 53-years-old man was admitted with sudden onset left sides weakness and vertigo. Neurologic examination showed dysarthria, mild dysphagia, Horner syndrome of right side, spontaneous horizontal jerking nystagmus to left side and right deviation of tongue at protrusion. Pain and temperature sensation of left trunk, left extremity and right face were decreased. Brain CT scan and brain MRI revealed focal hemorrhage in the right medulla. We report a case of pure primary medullary hemorrhage with undetermined etiology.
상수관로의 노후도 영향인자 및 가중치 산정에 관한 연구
김응석,김중훈,이현동 대한상하수도학회 2002 상하수도학회지 Vol.16 No.6
The purpose of this study is to estimate deterioration factors and weighting factors in pipe network which each local self-governments takes rehabilitation and replacement work present time. Deterioration factors in pipe network are able to effected of specific province or location related with water supply. Most of water supply pipes are laid under the ground, it is hard to quantify deterioration degree of water system. Moreover, the timing and economic limitation and insufficient information on the spot survey gives a difficulty to look over how old water supply system is. Accordingly, this study collects and analyses five data as the laying environment, visual analysis, analysis of soil contents, analysis of pipe material, and questionary survey data in water pipe of A city. The deterioration factor estimates 14 factors with excavation and experimental analysis and 9 factors without excavation and experimental analysis. Also, the weighting factors are estimated by using the multiple linear regressions and the linear programming. The estimated deterioration factor and weighting results are compared the analysis result of visual, pipe material, and soil contents with the Probabilistic Neural Network Model. Consequently, the model results of estimated 9 factors in this study and 14 factors show the 1-2% difference. The result show that the proposed model could be used to decide the deterioration condition of pipe line with real excavation and experimental analysis.
Digital 시대의 그래픽디자이너 역할에 관한 연구 : 컴퓨터 그래픽스 환경을 중심으로 Focused on the computer graphic's environment
강현응 한국디자인과학학회 2000 디자인과학연구 Vol.6 No.-
기존의 아티스트나 디자이너들은 작품제작 및 크레이티브의 창출에 많은 시간과 노력을 투자하는데 비해 디지털 이미지를 이용한 컴퓨터그래픽스의 사용은 기존의 표현 제한적인 문제점들과 논리적 사고를 넘어서 다른 어떤 매체로서는 도저히 따라 잡을 수 없는 존재감 있는 표현 및 공간개념으로서 새로운 정보통신과의 호환 등 새로운 이미지 표현의 무한한 가능성을 보이고 있다. 다른 매체와 차별화 되는 디지털이미지의 사용으로 컴퓨터그래픽스가 차지하는 비중이 점차 확대되어 가고있고, 이러한 표현방법은 다양한 시각적 효과 및 작품의 영역확장을 이어질 수 있다. 이와 같이 무한한 이미지 창출로서 컴퓨터그래픽스는 역사는 짧지만 디지털이미지를 사용함으로서 보다 간편하고 수월해짐은 물론 제작 방법 또한 다양해지고 있다. 현재 디지털이미지를 이용한 컴퓨터그래픽스는 아티스트나 그래픽 디자이너들의 발상을 자유롭게 표현하고 도구적 역할 및 창조적 디자인 작품에 많은 비중을 차지하고 있다. 그러나 상품의 분석력 등의 상실로 창조적 노력 없이 단순히 이미지 재창출의 결과물로서만 받아들인다면 향우 21세기 우리의 컴퓨터그래픽스의 발전속도는 느려질 수 밖에 없을 것이다. 이에 본 논문은 기존의 수공과정과의 비교, 분석으로 컴퓨터그래픽스를 이용한 디지털이미지 사용에 있어서의 발전방향과 이미지 프로세싱에 대해 짚어보고 앞으로 디지털이미지를 사용함에 있어서의 방향을 모색하는데 도움이 되고자 한다. 더불어 디자인 작품제작에 있어 컴퓨터그래픽스로 표현 되어지는 디지털이미지 등은 현대인의 공감을 얻는데 있어서 기억효과 및 시각적 정보전달에 인지도를 더욱더 향상시킬 수 있을 것이다. As a tool to create Infinite Images, cole the existing artists or designers devote a lot of time and efforts to their production and creation, computer graphic applications with the digital imaging have a great potentiality to express new art works an ontological work, compatibility with a new informative communication as a concept of space, and soon beyond the limitations of the existing expression methods and theoretical ideas for the medium. Differentiated from other mediums, the computer graphics with the digital imaging expand their applications for the design and their expression methods broaden various visual effects as well as boundaries of art mputer graphics have been simplify ailed the Interface and diversified the production process by means of digital imaging, although their history has a short history. Computer graphics with the digital imageow many artists or graphic designers to represent concepts freely and play an essential role as a tool for creative design works. However, if these applications were considered only as a method to represent image recreations without any creative endeavor due to production analysis and other reasons, it would be unavoidable to slow down the growth of computer graphics in the 21st century. It will be illustrated what ways computer graphics with the digital imaging are going to be advanced and the imaging process will be covered. Also, it will be found out the directions to make use of the digital imaging in the future. Furthermore, the digital images represented with computer graphics improve the recognition due to memory effects and the transmission of visual information to evoke the moderns' sympathy.
신응배,윤현식,김연권,김범수 漢陽大學校 環境工學硏究所 1998 環境科學論文集 Vol.19 No.-
강우시 발생하는 우수유출수에는 초기세척효과(first-flush-effect)로 BOD, SS를 비롯한 고농도의 다양한 오염물질이 함유되어 있으며, 방류선 수체로 유입되어 주변수체의 수질에 많은 악영향을 미치게 된다. 전세계적으로 이에 대한 많은 연구와 조사가 진행중에 있으며, EPA의 조사자료에 따르면 방류선 수체의 수질오염 문제 중 약 30%가 강우유출수로부터 기인하는 것으로 추정한바도 있다. 본 연구에서는 수도권에 인접해 위치하고 있는 S산업공단을 대상으로, 강우시 공단내에서 발생하는 우수유출수에 대해 유량변화 및 수질분석을 수행하였다. S공단은 석유·화학, 기계·금속업 등이 주종을 이루고 있고 분류식하수 배제방식을 채택하고 있어, 공단내 발생되는 우수유출수는 전량 지천으로 배출되고 있다. 시료채취는 공단을 배수구역별 5개 구역으로 구획 후, 해당 배수구역에 대하여 고정모니터링 방법을 적용하여 강우유출수의 수질을 분석·평가하였다. S산업공단에서 발생되는 우수유출수에는 BOD, COD, SS, TN, d-Fe, Zn, Cu 등의 다양한 종류의 오염물질이 검출되었다. 특히, 석유·화학산업, 식품산업, 일반폐기물 야적장 등에서는 BOD, COD, SS, TN등의 일반오염물질 항목들이, 기계·금속산업, 고철 야적장 지역에서는 중금속 항목의 오염물이 고농도로 측정되었다. During the early stages of a storm, significantly higher BOD, SS and other pollutants loadings may occur. This temporary increase is the result of the so -called "first-flush-effect". First flush runoff in the storm is a typical nonpoint source of polluting adjacent water bodies by overflowing pollutants accumulated in street surface from domestic, commerical and industrial area. The quality of storm water runoff is a major concern in the world. In the National Water Quality Inventory, 1990 Report to Congress, states estimated that ∼30% of identified case of water quality impairment are attributable to storm water discharges. (U.S. EPA 1992) In this study, "S" industrial complex located near Seoul metropolitan was investigated to evaluate characteristics of storm water runoff from industrial complex. Major industries of 'S' area were petroleum-chemical industry, metal-mechanical industry, etc. Also, storm water runoff was directly discharged to small artificial channel through storm sewer lines of separated sewer system in 'S' industrial complex. The concentration of several items such as BOD, COD, SS, TN, d-fe, Zn, Cu were founded in storm water runoff from the 'S' industrial complex catchment. Especially, petroleum-chemical industry, food industry, junkyard were exposed to high rate concentration of convention of conventional pollutants, such as BOD, COD, SS, TN, in first flush runoff samples. Higher levels of heavy metals were found at metal-mechanical industry, metal storage on site.
장현철,김경식,방준현,최천진,엄정식,김응준,이루지 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.2
The purpose of this study was to examine the perception and preference of skiers in a bid to provide ski resorts with useful information about successful positioning strategy. The subjects in this study were 9,722 skiers who purchased season tickets from N web site that sold ski season tickets. Their online purchasing route and page view were analyzed to find out what factors affected their purchase of ski season tickets. The findings of this study were as follows: First, 78 percent of the people investigated were make, and 22 percent were female. By age, the largest group was in their 20s(5,344 skiers), followed by those in their 30s(3,434), those in their 40s(631) and teenagers(229). Second, their page view rate with Yangji recorded highest with 24%, followed by Sungwoo Resort with 23% and Chonmasan with 13 percent. Third, by geographic area, the skiers from southern Gyeonggi province bought the largest number of tickets for the 2002/2003 season, followed by Gangweon province residents and northem Gyeonggi province dwellers. In the case of the 2003/2004 season, those from Gangweon provinece pruchased the most tickets, followed by southern Gyeonggi province dwellers and north Gyeonggi province residents.