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문종수,강종봉,현상엽 경남대학교 환경문제연구소 1999 환경연구 Vol.22 No.-
Waste Sand from casting industries have been dumped or buried on the ground, but it can be reused by several ways. Because waste sand from cast metal factories has not only high quality but also high volume percent of pure silica, we need to develop technology of converting this waste sand to ceramic tiles with economical efficiency. We prepared specimens at a relatively low and different temperature with various wasted sand contents, calcium hydroxide contents, and autoclaving conditions by hydrothermally synthesizing method. Mechanical characteristics and microstructures of samples were examined by SEM, XRD. Instron, and Porosimeter.
문성준 三陟大學校 1999 論文集 Vol.32 No.1
In order to obtain standard data relevant to the engine performance and exhaust gas composition for a NISSAN engine, experiment are conducted in both cases of full load and the result are obtained as follow 1. The Engine load has no effect on the exhaust gas composition, and 2. The variation of cooling water temperature also no great effect on the exhaust gas composition, and HC component is highly produced under rich mixture condition
문남원,박충희,김영민,이상준 제주대학교 공과대학 첨단기술연구소 2003 尖端技術硏究所論文集 Vol.14 No.1
We analyze bulletin board application currently used, and we propose the method that minimize disk I/O to enhance the I/O efficiency of the transmission of a large size of data. To improve the performance, we use fractal algorithm. Experiential result shows better performance than the other algorithm. Our next researches include the effort to improve the speed of computation by converting floating point operation to integer operation. And the method to enhance the precision of calculation is included also.
졸-겔법에 의한 폴리비닐피롤리돈함유 ??용액으로부터 Tio₂박막의 제조와 특성
문종수,강종봉,현상엽 慶南大學校 附設 工業技術硏究所 1999 硏究論文集 Vol.17 No.-
TiO₂는 페로브스카이트 구조를 가진 복합산화물계의 중요한 성분일 뿐만 아니라, 태양에너지를 광전기화학적으로 변환하여 물을 전기분해시키는 반도체 전극과 광촉매로 사용되는 매우 중요한 재료이다. 그러나 두꺼운 막 내부에 발생하는 응력 때문에 순수한 졸-겔 재료로 인한 0.2㎛보다 두꺼운 박막을 제조하는 것이 쉽지 않다. 본 연구에서는 졸-겔법의 딥-코팅법을 이용하여 비교적 가수분해 속도가 빨라 1회의 코팅으로 균열없이 두꺼운 박막을 제조하기 어려운 전이 금속계의 TiO₂세라믹 박막을 Polyvinylpyrrolidone(PVP)를 함유시킨 ?? 용액을 출발물질로 하여 두껍고 균질한 투명한 막을 얻고자 하였다. PVP를 함유한 용액을 3㎝/min의 인상속도로 실리카 유리기판에 침적시킨 후, 700℃에서 10분간 열처리를 행하여 박막을 얻었다. 이 결과 0.1∼0.9㎛ 두께의 투명한 박막을 얻었고, PVP를 함유하지 않은 박막보다 약 2-9배 정도 두꺼웠다. TiO₂is well known for it is importance as a component of complex-oxides with perovskite structure. TiO₂has been used for semiconductor electrodes and optical catalysies. In general, however, for it's rapitity of hydrolysis time respectively, it is quite difficult to prepare TiO₂thick film by sol-gel method. In this study, the researcher tried to prepare TiO₂thick film with homogeneousness. ?? solution with Polyvinylpyrrolidone(PVP) was used for starting material in sol-gel method. After dip-coating (3cm/min) of starting materials onto silica-glass substrate the thick film was prepared by heat-treatment (700℃, 10min). As a result, a transparent film with the thickness 0.1∼0.9 ㎛ was attained and it is thickness was 2∼9 times thicker than film without PVP
수치사진측량기법을 이용한 문화재의 3차원 모델링에 관한 연구
문두열,이봉재,신문섭,오상용 동의대학교 산업기술개발연구소 2005 産業技術硏究誌 Vol.19 No.-
고해상도의 디지털 카메라는 근거리 수치사진측량에서 널리 유용하게 사용되고 있으며 점차 활용도가 증가하고 있다. 또한 사진측량 장비의 급속한 발전으로 정밀도가 많이 향상되었고 컴퓨터를 이용한 지형공간정보체계기술의 발달로 더욱 정밀한 3차원 지형의 재현과 면적 및 토공량 산정이 가능하게 되었다. 본 연구에서는 휴대가 간편하고 수치영상의 자체저장능력을 지닌 디지털 카메라를 이용하여 촬영조건의 다양한 변화에 따른 위치오차를 분석하였으며 광속조정을 통하여 높은 정확도의 화소 좌표를 획득하여 3차원 지형의 모니터링을 위한 기초 자료로 사용할 수 있도록 하였다. 또한 근거리수치사진측량기법의 국부지역모형생성과 문화재의 보존과 복원을 보다 효율적으로 하기 위해 수치정보 분석에 관한 연구를 수행하여 봉분의 3차원 구현에 대한 활용방안을 모색하였다. Digital high resolution cameras are widely available, and are increasingly use in digital close-range photogrammetry. And photogrammetry instruments are developing rapidly and the precision is improving continuously. The building of 3D terrains of high precision are possible and the calculation of the areas or the earthwork volumes have high precision due to the development of the technique of the spatial information system using computer. Using the digital camera which has capacity of keeping numerical value by itself and easy carrying, we analyze the positioning error according to various change of photographing condition. Also we try to find a effective method of acquiring basis data for 3D monitoring of high-accuracy in pixel degree through digital close-range photogrammetry with bundle adjustment for local terrain model generation and 3D embodiment of tumulus. In the study is about to efficient analysis of digital information data for conservation of cultural properties.
최정문,이진성,이상호 고신대학교 의과대학 2009 고신대학교 의과대학 학술지 Vol.24 No.2
E형 간염은 수인성 바이러스 간염으로 산발적으로 발생되며, 이차적인 사람간 전파는 없다. 진단 방법은 HEV Ab IgM 이나 PCR로 혈청이나 분변에서 HEV genome을 발견한다. 1~4% 에서는 급성 간부전이 생기며 임산부나 이전에 간 질환이 있었던 환자에게는 전격성 간염이 생길 가능성이 높다. 현재, 국내에서 E형간염에 대한 사례보고가 있다, 그러나 E형간염에서 급성신부전을 동반한 증례는 없었다. 해외에서는 비핍뇨성 급성신부전과 동반된 E형간염이 보고된 적이 있다. 저자들은 E형 간염과 관련된 핍뇨성 급성신부전 환자 1예를 경험하였기에 문헌고찰과 함께 보고하는 바이다 Hepatitis E is water-borne viral hepatitis similar to hepatitis A and an endemic disease. Most cases of hepatitis E in industrialized countries are described in immigrants and visitors of endemic areas or are thought to be spread zoonotically(commonly swine). Hepatitis E is self-limited. But it can be followed by acute liver failure. Fulminant hepatitis is more likely in those who are pregnant or have preexisting liver disease. The diagnosis of hepatitis E is based upon the detection of its genome in serum or feces by PCR or the antibody(IgM) of hepatitis E virus. We report a case of oliguric acute renal failure associated with hepatitis E.
成秀光,黃文枝 대구효성가톨릭대학교 1986 연구논문집 Vol.33 No.1
This study was carried out to choice the most suitable lining fabric materials that has it's required various functions. Six fabrics of silk, rayon, cupra, acetate, polyester and nylon, each of which had 5 kinds as sample were used. According to four required functions for lining fabric, characteristics of 12 items that is warmth retaining, air permeability, moisture transmission, electrostatic property, extensibility, smoothness, crease resistance, stiffness, shrinkage, tensil strength, bursting strength, and surface abrasion resistance were measured. The most suitable lining fabric for good health is silk, for activity is polyester and rayon, for decoration is polyester and for durability is polyester and nylon.
Mun,Kwinam(Kwinam Mun),Lee,Mu-sung(Mu-sung Lee) 한국캐나다학회 2013 Asia-Pacific Journal of Canadian Studies (APJCS) Vol.19 No.2
Since the year 2001 when the Gyeonggi International Ceramic Bienale (GICB) was held for the first time in Korea, it has attracted positive global attention as well as strong domestic interest. Under the banner of improvement of local image, strengthening of local economy, enhancement of local citizen's pride, each and every local government is making its utmost efforts to attract domestic and foreign tourists alike by selecting major local festivals since the year 2005 when local autonomy system went into effect nationwide. As of today, the total number of Korean festivals is about 758 (KTO, 2013) and the number of Korean international festivals is approximately 40. In that context, three cities in Gyeonggi -Icheon/Yeoju/Gwangju- also have been co-hosting GICB which is held every two years since 2001 so as to promote the festival as an international class festival. A few researches have been conducted on the Biennali, but their focus has been mainly on the satisfaction of domestic tourists about the festival as a whole. Since this year marks the 50th anniversary of Korea-Canada diplomatic relations, this paper tries to divide the festival into three cities for the purpose of comparative analysis, and compares the satisfaction degrees between Korean and Canadian visitors in particular to the 7th GIBC.
CBN 공구의 형상이 고경도강의 절삭특성에 미치는 영향
문상돈,김태영 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.5
The purpose of this investigation is experimentally to clarify the machinability and optimum tool geometry on milling of hardened STD11 steel. In the finish process of face milling of high hardened STD11 steel by CBN tool, the optimum tool shape is suggested, which can minimize the tool fracture and chipping by impact. It is measured that cutting force, tool wear and surface roughness generated during single-insert face milling using various geometric CBN tools. It has been found that the optimal chamfer angle of CBN too is about-25°and the suitable chamfer width is 0.2mm. The nose radius of tool is the most excellent at 1.2㎜ in the viewpoint of tool wear and surface roughness.
SPME법에 의한 죽초 및 목초액 중의 휘발성 성분 분석
문성필,구창섭 한국목재공학회 2002 목재공학 Vol.30 No.4
졸참나무 (Quercus serrata), 맹종죽 (Phyllostachys pubescens) 및 소나무 (Pinus densiflora)로부터 제조한 미정제 초액의 휘발성 성분을 고상(固相) 미량추출(solid phase microextraction; SPME)법을 이용하여 분석하였다. 이들 초액 중의 휘발성화합물 분석을 위하여 극성 (CBP 20) 및 무극성 (CBP 1) 칼람을 사용하였으며, 이로부터 총 264개의 피크를 검출하였다. 이들 성분들 중 주요 화합물은 2-butanone, acetic acid, guaiacol, phenol, 4-ethyl guaiacol, cresol류, 4-ethyl phenol, 그리고 syringol이었다. 무극성 칼람을 사용함에 의하여 7개의 성분, 즉, 1-hydroxy-2-butanone, ethisolide, furfuryl acetate, 1-(2-furanyl)-1-propane, 1,2-dimethoxybenzene, 1,2-dimethoxybenzyl alcohol, phenyl acetate를 새로이 동정할 수 있었다. 이 성분들 중 페놀류가 주성분이었으며, 휘발성 성분의 49∼65%를 차지하였다. 죽초액의 경우 페놀류의 비율은 다른 두 목초액보다 낮았다. 그러나 중성화합물류 및 유기산류는 소나무 및 졸참나무로부터 제조한 목초액보다 그 비율이 더 높았다. 따라서 이들 죽초액과 목초액 간의 훈취의 차이는 목초액의 서로 다른 휘발성분의 함유량의 차이에 기인한다고 생각된다. Volatile compounds in three different kinds of crude vinegars obtained from oak (Quercus serrata), bamboo (Phyllostachys pubescens) and pine (Pinus densiflora) species were analyzed by the solid-phase microextraction (SPME) method. A total of 264 peaks were detected on the chromatograms obtained from the polar (CBP 20) and the nonpolar (CBP 1) columns, which were used for analyzing the volatile compounds in these vinegars. The major volatile compounds identified by using the polar column were 2-butanone, acetic acid, guaiacol, phenol, cresols, 4-ethyl guaiacol, 4-ethyl phenol, and syringol. Using the nonpolar column, seven compounds could be identified: 1,2-dimethoxybenzyl alcohol, 1-hydroxy-2-butanone, 1-(2-furanyl)-1-propane, ethisolide, furfuryl acetate, 1,2-dimethoxybenzene, phenyl acetate. The volatile compounds were classified into five groups: phenols, neutral compounds, organic acids, esters and others. The phenols were the main component and comprised 49∼65% of the volatile compounds of these vinegars. In the case of bamboo vinegar, the proportion of the phenols in the volatile compounds was lower than that of the two wood vinegars. However, the proportions of the neutral compounds and the organic acids were higher than those of the wood vinegars. Therefore, it seems that these differences of the proportions of the volatile compounds would make a certain difference of a smoke flavor between the bamboo vinegar and the wood vinegars.