양극산화와 절연파괴로 형성한 Ti-6Al-7Nb 합금의 산화피막 특성 평가

윤수연,이호진,배태성,송광엽 大韓齒科器材學會 2003 대한치과재료학회지 Vol.30 No.3

This study was performed to investigate the surface properties of electrochemically oxidized Ti-6Al-7Nb by anodic spark deposition technique. Discs of titanium alloy Ti-6Al-lNb of 20 mm in diameter and 2 mm in thickness were polished sequentially from #300 to #1,000 emery paper. They were ultrasonically washed in ethyl alcohol and acetone for 5 min and dried in a desiccator. Ti-6Al-7Nb was anodized in an electrolytic solution that was dissolved calcium and phosphate in water. The electrolytic voltage was set in the range of 170-320 V and the current density was 30 mA/cm^2. The surface oxide film was characterized by X-ray diffractometer, scanning electron microscope (SEM) and X-ray photoemission spectroscopy (XPS). The results obtained were summarized as follows; The main crystal structure of the titanium oxide was anatase type as analyzed with thin-film X-ray diffractometery. The coatings were porous with Pore diameter of 1~4 ㎛. The diameter of micropores increased with increasing the spark forming voltage. The porous coatings showed the growth of cell structure and more compact texture with increasing the voltage. Ca/P ratio in coatings was increased with increasing the voltage.

「월미도원(月尾桃園)」-월미공원 현상설계안 : 설계방법을 중심으로 Focused on the Design Methodology

김한배,선우성,정운수,김수연 한국전통조경학회 2003 한국전통조경학회지 Vol.21 No.3

Wolmi Park is located at the center of so called "Tri-Port" of history, regional culture and micro ecology. The design requirements for the competition can be ranged from the coexistence of history and modern life, the accentuation of mountain and sea landscapes, the continuity of the exterior and interior, and etc. Our design proposal started the process by analyzing "six strategies" of Baljon(1992) and "design languages" discussed in the traditional landscapes. The strategies were construed into the compositional concepts found in four sequential steps of traditional dance. Therefore, the basic land use and circulation units are contrived and organized by the "four steps"('step in', 'spread out', 'fold', 'unfold') and the "languages"('10 scenes' and '13 poetic words'). The proposed plan includes some plazas near access routes, three newly made traditional gardens of palace, royal residence and villa in the central area, the viewing promenade, and the ecological pond on the outskirt of the park.

저작근 공간에서 재발된 치성각화낭

임수연,허경회,이원진,최현배,최순철 대한구강악안면방사선학회 2008 Imaging Science in Dentistry Vol.38 No.2

The odontogenic keratocyst (OKC) is a developmental odontogenic cyst typically occurring in the jaws. Since the first description of OKC was published in 1956, the lesion has been of particular interest because of its specific histopathologic features, high recurrence rate, and aggressive behavior. Recurrences most commonly arise within bone at the site of the original cyst. However, as lining cells may find their way into surrounding tissues either from implantation during surgery or from cortical perforation recurrences may arise at a distance from the original cyst. Here, we report a rare case of recurrent OKC which was first developed in mandible and recurred within the masticatory space.

서울시내 고등학교 위탁급식의 급식비와 투자비의 실태 및 위탁업체의 기대수준 비교 분석

양일선,배환미,김현아,신서영,조미나,박수연,차진아,이보숙 한국식생활문화학회 2002 韓國食生活文化學會誌 Vol.17 No.5

The purposes of this study were to a) find out the operational characteristics of the contract-managed highschool foodservice in Seoul, b) investigate the expected level of meal-price and facilities investment cost perceived by contract-managed highschool foodservice managers c) compare the present level and expected level of meal-price and facilities investment cost. From October 12 to November 13 in 2001, the questionnaires were mailed to 249 high schools which was managed by contract foodservice company with respondent rate 40.2%. Data were analyzed using SPSS Win(10.0) for descriptive analysis and one group paired t-test. The results of this study were as follows ; 1. The student enrollment of highschools run by contract-managed foodservice was 1,243 with 72.6% participation rate of school lunch program. The average meal-price was 2,138 won. The average annual period of school foodservice operation was 156.78 days per year. The average contracting period was about 3 years. 2. The average cost concerned in the facilities investment amounts 169,578,180 won at the initial investment and 25,204,092 won at the repairs and maintenance cost in the course of operation. 3. The present level of meal-price and facilities investment cost were respectively 2,136won/meal and 171,157,336.72 won. And expected level.of meal-price and amount of facilities investment cost were 2,418.75 won and 121,353,215.19 won. Comparing the present level with expected level of the meal-price and facilities investment cost, expected level of meal-price was significantly higher than the present level of meal-price(p<.001) and expected level of facilities investment cost was significantly lower than present level of facilities investment cost(p<.001).

고추 역병 저항성 재료의 특성평가와 종자 증식

김동우,김병수,배수연,한정혜 慶北大學校農業科學技術硏究所 2002 慶北大農學誌 Vol.20 No.-

역병 저항성 재료로 도입하여 유지하고 있는 PI123469, PI201234, PI201232, AC2258 (=Line 29), CM334, KC268, KC358, KC820, KC821, KC822, KC823 (Line 29 = AC2258), KC462, KC463, KC464 혹은 이들 유전자원에서 선발한 계통들의 역병에 대한 저항성 검정, 원예적 특성 조사 및 종자 증식을 실시하였다. PI123469, PI201234, PI201232, AC2258, KC823 에서 선발된 계통들이 가장 저항성이 강한 것으로 나타났다. 동일한 유전자원에서 선발한 계통간에도 저항성 수준에서 현저한 차이가 관찰되는 경우가 있었으며, 이러한 경우는 주로 유지 증식과정에 자연교잡이 일어난 결과로 추정되었다. 따라서 순도 높은 저항성 재료를 얻기 위해서는 봉지를 씌워 자식종자를 채종하는 것이 가장 안전하며, 다음으로는 계통 망실 혹은 망상을 이용하는 것이 바람직한 것으로 판단되었다. Resistance to Phytophthora capsici and horticultural characteristics of selections from the resistance sources such as PI123469, PI201234, PI201232, AC2258 (=Line 29), CM334, KC268, KC358, KC820, KC821, KC822, KC823 (Line 29), KC462, KC463, KC464 were evaluated and recorded in the process of seed increase. Selections of PI123469, PI201234, PI201232, AC2258, KC823 (Line 29 = AC2258) of them showed the highest level of resistance. A considerable difference in the level of resistance was observed between lines selected from the same sources. The variation between selections derived from the same source was thought to ve attributable to natural cross-pollination that may have occurred during the seed increase. Therefore, securing self-pollinated seed by wrapping the flower buds before anthesis would be necessary to obtain genetivally pure resistant lines. The next alternative would be to increase the seed in small net houses for single line or field cage.

Capsicum chinense, 재래종 및 저항성 고추 유전자원에서 역병 저항성 계통 선발

김정훈,여승호,김동우,배수연,한정혜,황희숙,김병수 慶北大學校農業科學技術硏究所 2002 慶北大農學誌 Vol.20 No.-

2000년도에 검정에서 역병에 살아남은 개체들로부터 채종하여 육성한 Capsicum chinense 31계통에 대하여 역병 저항성을 검정한 결과 고도의 저항성을 나타내는 것은 발견되지 않았다. 2001년도의 검정에서 역병에 살아남은 개체로부터 채종한 재래종 26계통에 대하여 다시 역병 저항성 검정을 실시한 결과 KC180, KC230, KC195, KC194에서 다수의 개체가 살아남아 저항성을 나타내었다. 그러나 KC180과 KC230은 각각 AC2258과 CM334와 혼종된 것으로 관찰되었다. KC195와 KC194는 재래종의 형질을 유지하고 있는 것으로 관찰되었다. CM334의 보존 증식과정에 자연교잡이 일어난 것으로 보여 이의 순도향상을 위하여 채종년도별로 시료를 꺼내어 역병저항성 검정을 실시한 결과 가장 오래된 1992년도 채종종자에서부터 약간의 이형주가 관찰도기 시작하여 1995년부터 2001년도까지 시간이 경과함에 따라 많이 변형되어 있는 것을 알 수 있었다. 1992년도 종자에서 이형주를 제거하고 원형의 개체로부터 자식종자를 대량으로 채종하였다. 함께 공시한 AC2258은 순수한 것으로 확인되었다. 1995년도 채종 CM334 종자에서는 비록 혼종은 되었으나 측지발생이 적은 개체들이 발견되어 이들을 개체 선발하여 역병에 저항성이며 측지발생이 적은 계통으로 육성하고 있다. A total of 31 c. chinense lines selected from 2000 screening were tested again for resistance to P. capsici but resistance was not found in the lines. A total of 26 selections from Korean land races tested 2001 spring were tested again for resistance to P. capsici. KC180, KC230, KC195 and KC194 showed moderate resistance to P. capsici. However, it was apparent on the basis of hortivultural characteristics that KC180 and KC230 had been naturally crossed with AC2258 and CM334, respectively. CM334 and AC2248 seed lots that were increased in different years were taken out and tested for resistance to improve their genetic purity because the resistant genetic resources have been showing some off-types in the population. Off-types began to be found in 1992 seed lots and the proportion and degree of the offs was increasing with time up to 2001. Plants true to the type in 1992 seed lots were selected and their inbred seeds were mass produced in a net cage in the greenhouse. AC2258 included in the experiment number of lateral branching at cotyledonary axil, although they were off from the original in the experiment together was uniform. In 1995 seed lost of CM334, plants with resistance to P. capsici and low or no number of lateral branching at cotyledonary axil, although they were off from the original CM334, were found and selection was applied to breed lines fixed in the characters.

Characteristics of Sugar Extract of Medicinal Plants Fermented with Lactobacillus plantarum DK119

Su-Yeon Bae,Sa-Woong Jung,Min-Kyung Park 한국식품영양과학회 2017 한국식품영양과학회 학술대회발표집 Vol.2016 No.10

Preparation, Structural Characteristics, and Properties of Airlaid Nonwoven Silk Fabric

Yeon Su Bae(배연수),In Chul Um(엄인철) 한국고분자학회 2020 폴리머 Vol.44 No.6

본 연구에서는 실크 단사를 공기 분산 후 습윤 및 열압착 처리를 통하여 새로운 에어레이드 실크부직포를 제조하고 그 구조특성과 성질에 대해 살펴보았다. 실크사의 길이가 증가할수록 웹에서 실크사의 분산성은 나빠지고, 실크웹의 인장강도는 감소하였다. 열압착 온도가 200 ℃까지 증가함에 따라 에어레이드 실크부직포의 강도와 신도가 증가하였다가 그 이후에는 감소하여 200 ℃가 부직포의 기계적 물성을 위한 최적의 압착온도로 밝혀졌다. 2.5% 세리신 수용액을 실크웹에 6 mL 첨가 시까지는 실크부직포의 기계적 물성 향상에 도움이 되었으나 그 이후에는 물성 개선에 도움이 되지 못하는 것으로 나타났다. 본 연구결과를 통해 새로운 실크부직포가 공기분산법을 이용하여 제조가능함을 확인할 수 있었고, 다만 향후에 실크단사보다는 실크섬유를 이용하는 등 제조 공정조건에 대한 개선이 필요할 것으로 생각된다. In this study, short silk yarns were manually airlaid, wetted, and hot-pressed to fabricate new airlaid nonwoven silk fabric. Furthermore, the structural characteristics and properties of the nonwoven fabric were examined. As the length of silk yarn increased, the dispersion of silk yarn in the web worsened and the tensile strength of the resultant nonwoven silk fabric decreased. As the press temperature was increased to 200 ℃, the tensile strength and elongation of the airlaid nonwoven silk fabric increased. However, it subsequently decreased with further increase in the press temperature, indicating that 200 ℃ is the optimum press temperature for obtaining the best mechanical properties of the nonwoven silk fabric. An addition of a 2.5% aqueous sericin solution improved the mechanical properties of the nonwoven silk fabric up to a certain point (i.e., 6 mL); however, further addition of the sericin solution was not helpful. This study demonstrated that nonwoven silk fabric can be fabricated using the airlaid method, although the process should be further improved by controlling preparation conditions, such as using short silk fiber rather than short silk yarn.

Symposium 1 : Genomics and Bioinformatics ; Large Scale SNP Marker Discovery in a Korean Population Using MassARRAY

( Yeon Su Lee ),( Sook Young Kim ),( Jae Heup Kim ),( Kyung Hee Park ),( Yeon A Park ),( Ok Kyoung Son ),( Ji Young Jo ),( Kwang Sung Ahn ),( Yong Ick Ji ),( Joo Bae Park ) 한국생화학분자생물학회 (구 한국생화학회) 2002 추계학술대회집 Vol.2002 No.-

Effect of treatment temperature on mechanical properties of silk textiles made with silk/polyurethane core-spun yarn

Bae, Yeon Su,Um, In Chul Korean Society of Sericultural Science 2016 International Journal of Industrial Entomology Vol.33 No.2

Silk has been used extensively in textile applications because of its good luster and feel. However, the low elongation and elastic recovery of silk has limited its use in a wider variety of textile applications. In this study, silk textile samples were made with a highly twisted silk/polyurethane core-spun yarn. They were immersed in water and dried at different temperatures, and the effect of treatment temperature on the mechanical properties of the silk textile was examined. It was found that the water temperature strongly affected the morphology and mechanical properties of the silk textile, whereas the drying temperature did not. As the water temperature was increased, the weft silk yarn became tangled and the interval between warp yarns decreased, resulting in shrinkage of the silk textile. When the silk textile was immersed in water at high temperature (i.e., $100^{\circ}C$), the elongation of the textile increased eight-fold as compared to an untreated silk textile. The maximum elastic recovery ratio of the silk textile was 96.7%.