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최승호,이열 한국항공대학교 1996 論文集 Vol.34 No.-
평판위 난류 경계층내의 표면 마찰력에 재한 실험적 연구를 수행하였다. 표면 마찰력은 측정면에 위치한 oil의 두께 변화율을 광학적으로 검출해내는 LISF를 이용하여 측정하였다. LISF를 이용한 표면마찰력 측정법은 기존의 방법들을 적용할 수 없는 다양한 형태의 유동 현상에 서로 신뢰도가 높은 자료를 획득할 수 있다. 본 연구는 평판위의 난류유동에 대해 LISF를 설치, 운용하는데 중점을 두었으며, LISF에 의해 측정된 값을 속도분포법(Clauser-Plot method)을 통해 계산된 값과 비교하여 좋은 결과를 얻었다. An experimental study of skin friction in a turbulent boundary-layer on a flat plate has been carried out. The skin friction measurements are made the laser interferometer skin friction (LISF) meter, which optically detects the rate of thinning of an oil applied to the test surface. This technique produces reliable skin friction data over a wide range of flow situations, where traditional skin friction methods ate not applicable. The emphasis in the present study is placed on the set-up of the LISF meter on a flat plate, and the present measured data using LISF technique show a good comparison with the value form the velocity profile technique(Clauser-Plot method).
정승열,이광희,라지영,안소연,김윤희 大韓小兒齒科學會 2010 大韓小兒齒科學會誌 Vol.37 No.2
The purpose of this study was to identify patterns of caries in the dentition of preschool children using cluster analysis and multidimensional scaling. 815 preschool children aged 36-71 months old were examined for caries experience. The first four clusters in the cluster analysis were (1) molars, (2) upper incisors, (3) lower 1st molars, and (4) upper 1st molars in teeth, (1) occlusal surfaces of lower molars and upper 2nd molars, (2) mesial surfaces of upper central incisors, (3) occlusal surfaces of lower 1st molars, and (4) separation between occlusal surfaces of upper and lower 2nd molars in tooth surfaces, and (1) proximal surfaces of upper anterior teeth, (2) occlusal surfaces of lower molars, (3) buccolingual surfaces of upper anterior teeth and (4) buccolingual, proximal, and occlusal surfaces of upper molars and buccolingual and proximal surfaces of lower molars in tooth surfaces groups. In the multidimensional scaling analysis, teeth could be divided into lower 1st molars, upper 1st molars, upper central incisors, upper lateral incisors, lower 2nd molars, upper 2nd molars, and the rest(canines, lower incisors), tooth surfaces could be divided into occlusal surfaces of lower molars, mesial surfaces of upper central incisors, occlusal surfaces of upper molars, and the rest, and tooth surface groups could be divided into proximal surfaces of upper anterior teeth, buccolingual surfaces of upper anteiror teeth, occlusal surfaces of lower molars, and the rest in the order of the distance from others. In the cluster analysis and the multidimensional scaling analysis, caries patterns were different according to the age. 유치열에 존재하는 우식패턴을 연구하기 위하여 유치열을 가진 유아들을 대상으로 치면별 우식경험도 조사를 실시하고 군집분석과 다차원척도분석을 실시하였다. 연구대상은 367H 월 이상 71 개 월 이하의 어린이 815명 이 었다. 군집분석에서 먼저 분리된 네 개의 군집은, 유치는 (l) 유구치, (2) 상악 유절치, (3) 하악 제1유구치, (4) 상악 제1유구치, 유치면은 (1) 하악 유구치 교합면과 상악 제 2유구치 교합면, (2) 상악 유중절치 근심면, (3) 하악 제1유구치 교합면, (4) 상하악 제2유구치 교합면의 분리, 유치면군은 (l) 상악 유전치 인접면, (2) 하악 유구치 교합면, (3) 상악 유전치 협설면, (4) 상악 유구치 협설면, 인접면, 교합면 및 하악 유구치 협설면과 인접면이었다. 다차원척도분석에서 상호간에 가장 멀리 떨어진 순서로 보았을 때, 유치는 하악 제 1유구치 , 상악 제 1유구치 , 상악 유중절치, 상악 유측절치, 하악 제 2유구치, 상악 제 2유구치, 기타 유치(유견치, 하악 유절치)로 나눌 수 있었고, 유치면은 하악 유구치 교합면, 상악 유중절치 근심면, 상악 유구치 교합면, 기타 유치면으로 나눌 수 있었으며, 유치면군은 상악 유전치 인접면, 상악 유전치 협설면, 하악 유구치 교합면, 기타 유치면군으로 나눌 수 있었다.
Wire Saw 슬러리로부터 Si와 SiC의 선택적 회수
한승열,이종대,전진혁,박노국,이태진,류시옥 嶺南大學校 工業技術硏究所 2004 工業技術硏究所論文集 Vol.32 No.1
This study was focused on the recovery of Si and SiC from wire saw slurry in wire saw slicing process. In order to separate Si and SiC from wire saw slurry, alkali dissolution method was used and then Na₂O showed superior dissolution property of Si. At this time, SiC was separated as powder from alkali aqueous solution. Si was dissolved as a liquid in alkali aqueous solution. After removing SiC powder, the powder was obtained by drying alkali aqueous solution and then it's XRD analysis showed that it was the water glass (Na₂SiO₃).
윤승환,김근수,장호열,김영수 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.7
12l patients with cervical(45 patients). thoracolumbar(76 patients) compression or mild burst fractures from January 1984 to December 1994 were studied : 98 patients were treated postural reduction with hyperextension posture and 23 patients were with postural reduction and surgical methods We compared the initial and post-reduction compression height ratio. wedge angls and kyphosis angle of compression fractures The results were not only expansion of a compressed vertebral body but also successful fusion. The neurological recovery status according to Frankei classification was also improved after postural reduction. Most of the compression fractures or stable burst fractures of the cervical. thoracolumbar spines can be restored by the postural reduction
金聖烈,崔宇永 충남대학교 농업과학연구소 1978 農業技術硏究報告 Vol.5 No.2
A series of experiments over three years was planned for practical application of rhizobia in farms and grass lands in Korea. This is the report for the studies of the first year mainly on the isolation and characterization of rhizobial strains, and on the assessment of their nodulation abilities and nitrogen fixation capacities. 1. Total number of 88 strains for soybean group and 22 strains for pea and vetch group was isolated from nodules which were taken from legumes grown in Daekwanyong, Cheju and various places in Korea. 2. Morphological and cultural characteristics of the strains were studied, and attempts were also made to investigate their antigenic properties and to demonstrate lysogenic strains in these groups. The results were: ⅰ) the isolates varied in cultural characteristics on yeast mannitol broth and agar, and in degree of congo red absorption; ⅱ) similarities in their antigenic properties were found between/among the strains: G-3/G-9/D216, G-20/G-52 in soybean group; ⅲ) no lysogeny was found in the strains of these groups. 3. Plant infection tests by test tube and bottle method in light room were carried out to elucidate the ability of the strains to nodulate specific legumes and of the capacity of such nodules to fix atmospheric nitrogen. The isolates were grouped into non-invasive, ineffective, or effective to the legumes. Those strains which produced effective nodules, supporting similar level of growth as nitrate control, were; P-3, 4 and 8 in pea and vetch group; G-23, 27, and, D-216 in soybean group.