법랑질 접착에 대한 습윤 효과

고근호,조영곤,진철희,유상훈,김종욱,박병철,기영재,최희영,김종진 大韓齒科保存學會 2004 Restorative Dentistry & Endodontics Vol.29 No.3

This study evaluated the microleakage and interfacial gap between enamel and composite resin under the dry and wet condition of the enamel surface, V shaped class 5 cavities were prepared on the occlusal portion of extracted human molars. Samples were divided into three groups: D group (air dry for 10-15s), BD group (blot dry with moist cotton pellet), and DR group (air dry for 10-15s and rewet with Aqua-Prep F for 20s). Cavities were filled using Aelitefil composite resin after applied One-Step. Microleakage was tested by 2% methylene blue dye solution and the data were statistically analysed by Kruskal-Wallis test and Mann-Whitney test. Also Enamel-resin interface was observed under SEM. Group BD showed statistically lower microleakage than group D (p〈0.05). but there was no statistically significant difference between group BD and DR (p)0.05). At the enamel-resin interface, group D showed the gap of 2 ㎛ thickness, but group BD and DR showed close adaptation. In conclusion, the use of blot dry and rewetting agent (Aqua-Prep F) resulted in decreased microleakage and improved adhesion between enamel and resin when using One-Step.

Effects of Humidity on the Microstructure and the Ferroelectric Properties of Sol-Gel grown P(VDF-TrFE) Films

Young Joon Ko,진다운,Dae Sol Kong,Jong Hoon Jung 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.4

We report the microstructure and the ferroelectric properties of poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] films grown under various humidity conditions and synthesis times by using a sol-gel method. When the synthesis time under a humid condition was short (approximately 30 min), the moisture in the environment affected only the surface morphology without any loss of ferroelectricity for the P(VDF-TrFE) films. In contrast, when the synthesis time was long (approximately 90 min), the moisture strongly affected the microstructure and the ferroelectric properties of P(VDF-TrFE). The transparent P(VDF-TrFE) film became opaque at high humidity. Scanning electron microscopy revealed numerous pores on the surface of and inside the film. The pores reduced the Young's modulus considerably from 4.15 to 0.97 GPa for the films grown at 20 and 80% relative humidity, respectively. In addition, the ferroelectric hysteresis loop disappeared at humidities above 60%. This work provides upper limits for the humidity and the synthesis time for the growth of high-quality P(VDF-TrFE) films by using a sol-gel method.

공용 동선공간 체계에 의한 대형병원의 형태구성에 관한 연구

고영종,이정만 한국의료복지시설학회 2002 의료·복지 건축 Vol.8 No.1

Large hospital designs try to accommodate functional needs and spatial organization. The purpose of this study is to propose an effective compositional method by horizontal interconnection of public circulation spaces with 'hospital street'. 'Hospital street' and network of public circulation spaces are major elements of consideration for the design of large hospitals, which not only connect functional components but also provide satisfying environment, amenity an patients' life.

PCS 단말기용 유전체 공진기 대역 통과 필터의 설계 및 제작

고영준,김종현 광운대학교 신기술연구소 1998 신기술연구소논문집 Vol.27 No.-

본 논문에서는 유전체 공진기와 캐패시터 또는 인덕터를 사용하여 원하는 주파수 대역에서 감쇠극을 갖는 대역 통과 필터를 설계 및 제작하였다. 이때, λ/4 TEM mode 세라믹 유전체 공진기를 사용하였으며 필터 설계시 유전체 공진기는 종단이 단락된 전송선로로 해석하였다. 필터의 통과대역은 1800~1825 MHz 이고 측정결과 필터의 중심 주파수. 대역폭 및 감쇠극의 주파수가 설계치와 일치하였다. In this paper. a band pass filter with attenuation poles in the desired frequency range was realized using series capacitor or inductor and dielectric resonator. And ceramic dielectric resonator which modeled as a transmission line with a shorted termination was used. The measured center frequency. bandwidth and attenuation frequency values closely agree with the design values.

고추수침엑스가 Streptococcus mutans B-13의 세포외 다당류 합성에 미치는 영향에 관한 전자현미경적 연구

고재승,정태영,이종흔,정동균,김각균 대한구강생물학회 1980 International Journal of Oral Biology Vol.4 No.1

Streptococcus mutans B-13 was cultured in sucrose broth containing water-extract of capsicum and the effect of the extract was observed with the aid of electron microscope, in an effort to elucidate the anti-cariogenic effect of capsicum in white rats observed during the previous experiment. Growth curve was also obtained in the presence or in the absence of the extract. The results were as follows : 1. S. mutans B-13 produce no extracellular polysaccharide in glucose broth. 2. In sucrose broth, extracellular polysaccharides with two components were produced ; that is, electron-dense, globular and relatively homogenous material and widespread fibrillar component. 3. In sucrose broth containing water-extract of capsicum, production of extracellular polysaccharide was almost completely suppressed. Growth was also influenced by the extract. 4. It seems that certain material which is capable of suppressing the production of extracellular polysaccharide and of influencing growth is present in water-extract of capsicum and that anti-cariogenic effect of capsicum is probably related to this unidentified material.

茶나무 遺傳子源의 導入과 特性評價 調査

고영옥,이종옥 진주산업대학교 농업기술연구소 2006 農業技術硏究所報 Vol.19 No.-

茶나무 遺傳子源의 導入과 特性評價 調査를위하여 차나무품종은 우리나라 재래종(실생), 일본품종은 2년생(Husoonふうしゅん. Meirokuめいりょく. Yamanoibuki山の息吹.Yabukitaやぶきや)을각각1000포기씩 정식을 했으며 정식거리는170cm×30cm간격으로 을자(乙)형으로 2줄씩‘04년3월에 정식했다. 특성평가를 위한 조사결과는 나쁜 환경의 영향으로 정식1년차는 비교를 못하였다. 정식2년차의 특성조사결과는 다음과 같다. 차나무의 품종간 특성 차는 컸다. 습해와 월동에는 재래종이 강했다 수장은 Husoon이 좋고 그 외는 비슷하다. 엽수는 Meiroku와 Husoon이 많았다. 엽형지수는 품종간에 비슷하며, 엽폭은 Yabukita가 가장 넓고 그 외는 비슷하고, 엽장은Meiroku가 가장 길었다. 차나무를 2년간 특성조사로 품종의 우열을 판단하기는 무리라고 생각하며, 앞으로 1-2년 후에 좋은 결과를 가져야 할 줄로 본다. The purpose of this study was to investigate gene source and test of characteristic from domestic variety in korea and japan in tea three variety (two yearly tea three; Husoon, Meiroku, Yamanoibuki, Yabukita) by this examine field conducted to setting about 1,000Planting. This examine field road carry out made in panting road on two line( 170*30cm ) with ulja form Where was start planting from March. 2004 year. These of tea threes were many difference between domestic variety and introduced species during on characteristic variety. In the case of wet injury and over wintering in tea three was good against with domestic variety. The tea three length is good of husoon(two yearly tea three) and so on be similar and the mriroku and husoon of variety in leaf number are many the other variety. Leaf shape index in tea three are similar through both of variety and leaf width, leaf length are far the better such as this is YabuLita, that is Meiroku.

농촌지역의 연령에 따른 체격 및 건강관련 체력의 변화

고영완,김종언 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.6

This study selects total 1369 including 613 men and 756 women except absent subjects by assigning 10 men and 10 women between teens and forties and 20 men and 20 women in their sixties and seventies who are residing at nine cup and myeon units of rural area in H gun as the subjects of research and as a result of examining and analyzing their physique, physical strength the following conclusions are obtained. 1. Physique of Male and Female Subjects in Rural Areas 1) Height male group, those in their teens and seventies were smaller than those in their fifties, forties, thirties and twenties, female group, those in over their seventies were smaller than those in their sixties, fifties, forties, teens, thirties and twenties(p<.05). 2) Weight: male group, those in their teens weighed less than those in their sixties, fifties, twenties, thirties and forties and, Female group, those in their forties weighter more than those in their sixties and thirties (p<.05). 2. Physical Strength of Male and Female Subjects in Rural Areas 1) Muscular Strength(Left Hand): male group, those in their seventies or more had lower muscular strength than those in their sixties, fifties, twenties, Forties and thirties, female group, those in their sixties had lower muscular strength than those in their teens, fifties, twenties, forties and thirties (p<.05). 2) Muscular Strength(Right Hand): male group, those in their seventies or more had lower muscular strength than those in their sixties, fifties, twenties, forties and thirties, female group, those in their seventies or more had lower than those in their sixties, teens, fifties, twenties, forties and thirties (p<.05). 3) Muscular Endurance: male group, those in their sixties and seventies had lower muscular endurance than those in their Forties, thirties, twenties and teens, Female group, those in their seventies or more, sixties and fifties had lower than those in their forties, thirties, twenties and teens(p<.05). 4). Cardiopulmonary Endurance: male group, those in their teens had higher than those in their twenties, thirties, fifties, sixties and seventies, female group, those in their sixties and seventies had lower than those in their thirties, twenties, forties and fifties (p<.05). 5) Power: both male and Female groups, those in their sixties and seventies had lower than those in their sixties, fifties, forties, thirties, twenties and teens (p<.05). 6) Agility: male group, those in their seventies or more had lower than those in their sixties, fifties, forties, thirties, twenties and teens, female group, those in their sixties had lower than those in their fifties, forties, twenties, teen and thirties (p<.05). 7) Equilibrium: male group, those in their seventies or more and sixties had lower than those in their forties, twenties, teens and thirties, female group, those in their fifties and forties had lower than those in their twenties, teens and thirties (p<.05). 8) Flexibility: male group, those in their thirties and twenties had higher than those in their seventies, fifties, sixties, teens and forties, female group, those in their seventies or more had lower than those in their sixties, thirties, fifties and forties (p<.05).

야생차의 생육특성에 관한 연구

고영옥,이종옥,최주호,정영섭,이용호 진주산업대학교 농업기술연구소 2003 農業技術硏究所報 Vol.16 No.-

본 시험은 최근 각광 받고있는 차나무의 우량품종 육성과 재배에 관한 기초자료를 구명코자 2001년 3월부터 2002년 10월까지 남부지방 자생차의 지리적·생태학적 특성 조사와 RAPD 유연관계를 비교 분석하였으며 그 결과는 다음과 같다. 1. 녹차 자생지 토양의 pH는 4.1 ~ 6.2로 내대리가(pH 6.2) 가장 높았으며, 다사리가 pH 4.1로 가장 낮았다. 2. P_(2)O_(5)는 농업기술원과 다솔사 차가 319㎎/㎏ 이상으로 가장 높았고, 송광사와 다압리는 20㎎/㎏ 이하로 가장 낮았다. 3. 차 포장의 지형은 혜산서원, 농업기술원을 제외한 대부분 자생지가 해발 220m 이상의 산간지 였으며, 북서풍을 막을 수 있는 남향 또는 남서방향이었다. 4. 순천시 송광사, 사천시 배방사, 다솔사, 밀양시 혜산서원, 고성군 옥천사, 남해군 보리암 차엽은 yabukita 보다 대엽이었다. 5. 엽장은 다솔사가 13.9㎝로 가장 길었고 도심다원은 5.2㎝로 가장 짧았으며, 엽폭은 배방사가 4.9㎝로 가장 넓었으며 매암다원이 2.1㎝로 가장 좁았다. 6. 거치수는 배방사가 79개로 가장 많았으며 천은사가 50개로 가장 적었다. 7. 증폭된 DNA의 band pattern을 비교해 보면 절편 크기는 300~3000bp사이였고, 지역별 band 영상은 뚜렷하였다. 8. Primer별 평균 band수는 7.6개였으며, 22개 Primer당 전체 band 수는 76~192개 범위였다. 9. RAPD UPGA에 의한 유연관계 분석을 위한 similarity matrix값에 근거하여 유연성 분석을 실시한 결과 차가 유전적 거리지수 0.10이내에 우선적으로 유집되었으며, 고성군 옥천사, 밀양시 혜산서원, 엄광사 수집종은 0.25의 유전적 거리지수로 유집되었으며 모두 대엽이었다. This study was carried out to investigate the geographical and ecological characteristics of self-sown teas in the southern southern part of South Korea and evolutionary relationship based on the RAPD analysis data. Each sample was collected from March, 2001 to October, 2002 along with basic characteristics of its cultivation. The results are described as follow : 1. The pH of soils in the habitat of collected green teas were 4.1~6.2. The highest pH(6.2) was shown from the soil of Naedae-ri while that of Dasa-ri showed the lowest pH value. 2. The highest content (319㎎/㎏) of P_(2)O_(5) was examined from the tea of the Agricultural Research Extension Services (ARES) while the lowest values were obtained from the collected samples of Shonggwansa and Dasa-ri (20mg/kg). 3. In terms of geographical aspects, most of the areas that samples were collected are mountains with 220 meters above the sea level and are in the direction of the southern exposure and the southeast except Hyesan lecture hall and ARES.4. In Shonggwangsa of Shunchon-si, Baebangsa and Dasolsa of Sacheon-si, Hyesan lecture hall of Miryang-si, Okcheon-sa of Goseong-gn and Boriam of Namhae-gn, the self-sown teas were a kind of bigger size of leaf than that of Yabukita. 5. The tea of Dasolsa had the longest leaf of 13.9㎝, but the tea of Dosim tea plantation had the shortest leaf of 5.2㎝. Baebangsa showed the broadest leaf width of 4.9㎝, and Maeam tea plantation showed the narrowest leaf width of 2.1㎝. 6. The tea of Baebangsa had 79 serrations of the largest number but Cheoneunsa had 50 serrations of the smallest number. 7. When the band pattern of the amplified DNA by PCR were compared, a size of the bands was between 300 and 3,000bp. The band image by area of gathering seeds was distinct. 8. There were the average number of 7.6 bands per primer. The number of total bands per 22 Primers were between 76 and 192 bands. 9. The result values of a flexibility analysis based on a similarity matrix value for the flexible relation analysis by RAPD UPGA, were attracted within 0.10 of inherited distance index. The collected species in Okcheonsa of Goseong-gn, Hyesan lecture hall and Eomgwangsa of Miryang-si were attracted within the inherited distance index of 0.25 and were all the kind of the big leaf.

Preparation of petroleum impregnating pitches from pyrolysis fuel oil using two‑step heat treatments

Jong‑Eun Choi,Seunghyun Ko,Young‑Pyo Jeon 한국탄소학회 2019 Carbon Letters Vol.29 No.4

Petroleum-based impregnating pitches were prepared from pyrolysis fuel oil (PFO) using a two-step heat treatment without a separation process. The pressurized heat treatment, the first step, was used to improve the properties of the pitches and enhance the product yield by promoting the cracking and polymerization of the components in the PFO. An atmospheric heat treatment as the second step was used only to synthesize the impregnating pitches from the liquid pitches prepared during the first step. The prepared impregnating pitches had the properties of a commercial petroleum-based impregnating pitch. The impregnation performance was evaluated by HT-XRD and an impregnation test. The HT-XRD results showed changes in the stacked structure of the pitches at the impregnation temperature. The bulk density of the carbon block was increased to 14.3% and the porosity was reduced by 10.3% after the impregnation/recarbonization process. The high reaction temperature during the first step induced the formation of quinoline insoluble (QI) components during the second step of the treatment, and the QI components adversely affected the impregnation process.

放射線에 의한 大麥 M_2에서 突然變異體의 形質分布

高永王,元鐘樂 진주산업대학교 1983 論文集 Vol.21 No.-

감마總을 處理한 大麥 M_2에서 突然變異體들의 形質의 分布와 短稈變異體들의 重要形質을 調査하여 얻어진 結果를 要約하면 다음과 같다. 1. 選拔된 短稈變異體들의 平均 稈長은 34.9㎝였고 7㎝에서 49㎝까지 分布되어 있었으며 母品種에 비해 약 20∼60㎝ 短稈化되었다. 2. M_2 全體集團의 出穗期는 母品種에 비해 대체로 늦어지는 경향이 었으나 出穗期가 21日 단축된 旱期出穗變異體를 選拔할 수 있었다. 3. M_2에서 不稔이삭은 17∼65%의 不稔率分布를 보였으며 20∼30%의 不稔率個體가 가장 많았다. 4. 短稈變異體들의 稈長과 穗長, 稈長과 穗當粒數, 穗長과 穗當粒數와는 正의 相關이 있었다. 5. 短稈變異體중에서 穗長과 穗當粒數가 母品種에 비해 同時에 增加된 系統의 選拔이 可能하였다. The purposes of the experiment were to investigate the distribution of characters of mutants selected from M_2 genaration of barley treated with gamma­ray, and relationships between different characters of short culm mutants. Culm length of short culm mutants averaged 34.9㎝, with a range from 7㎝ to 49㎝ in different lines and culm length of the mutants were shortened about 20∼60㎝ as compared to the mother variety. Although heading data of M_2 population is generally late than that of mother line, it was possible to select early mutants with different heading dates. Sterile percentage of the sterile spike mutants was ranged with 16∼65% in different lines and the frequency of the mutant plants having sterility of 20∼30% was highest among the different sterile plants. Positive correlations between culm and spike length, culm length and seed number per spike, spike length and seed number per spike were found in short culm mutant lines. Among the short culm mutants selected, some lines were increased in spike length and seed number per spike than mother lines.