난소적출과 에스트로젠 투여가 백서의 하악골 구조에 미치는 영향

이형순,홍성규,김정기 대한치과교정학회 1999 대한치과교정학회지 Vol.29 No.1

본 실험은 폐경기 골다공증 여성의 교정치료에서 일어날 수 있는 하악골의 구조의 변화와 에스트로젠 투여 효과를 추정하기 위한 연구의 일환으로 난소를 적출한 군과 에스트로젠 투여 및 비투여군으로 분류하고 미세방사선사진으로 하악골을 촬영하여 이의 골 면적을 측정하고 조직 변화를 관찰하였다. 생후 4개월된 Sprauge-Dawley계 백서 50마리를 난소적출(OVE)군, 난소적출 후 에스트로젠 투여(OVE-EST)군, sham operation 시행후 에스트로젠 투여(EST)군으로 분류하여 각군을 수술후, 5주, 6주, 7주째 희생시켜 하악골을 적출한 후 좌측 하악골은 비탈회표본으로 제작하여 미세방사선사진을 통해 해면골을 관찰하고 면적을 측정하였으며 우측 하악골은 탈회표본으로 제작하여 병리조직학적인 소견을 관찰하여 다음 과 같은 결과를 얻었다. 1. 하악골의 전체골면적에 대한 피적골의 비율분석에서 OVE군, OVE-EST군, EST군 모두에서 통계적으로 유의한 변화가 없었다. 2. OVE군은 대조군에 비해 5, 6, 7주째로 갈수록 골수강의 비율이 증가하였는데(p<0.05), 백서의 난소제거가 하악골에서도 골소주를 소실시켜 골수강을 확장시켰다. 3. OVE-EST군은 5주째는 골수강의 비율이 약간 증가되어 있었으나 점차 감소하여 7주째에 유의하게 적었고(p<0.05), EST군은 6주째부터 골수강의 비율이 현저히 감소되었는데 (p<0.05), 에스트로젠이 골수강의 크기를 감소시키는 효과가 있음을 알수 있었다. 4. 미세방사선사진과 병리조직학적 소견상 OVE군에서 골수강들의 크기가 확정되었고 파골세포들이 불규칙한 변연부에서 다수 관찰된 반면, OVE-EST군은 점점 치밀해지는 골소주들로 골수강이 작아지는 양상을 나타냈고, EST군에서는 풍부하고 치밀한 골소주들로 골수강들의 크기가 작아졌다. The purpose of this study was to evaluate the changes of cancellous and cortical bone and the effect of estrogen in ovariectomized rats. Fifty female rats, 250gm in body weight, were divided into three groups : ovariectomized group(OVE), ovariectomized and estrogen-injected group(OVE-EST), and sham operated and estrogen-injected group(EST). Bilateral ovariectomy was performed at the onset of the experiment. In OVE-EST group and EST group, estrogen was injected 50μg/kg B. W. every other days from 3 weeks after surgery to sacrifice. Each five rats were sacrificed after 5, 6, 7 weeks. One side of mandibular body was radiographed with a soft x-ray apparatus(Hitex Co., Ltd., Japan ). Thereafter the obtained microradiographs were used for the morphometric analysis using a Image analyzer. The morphometric analysis was performed for parameters such as total bone area. cortex bone area and medullary bone area. The other side of the mandibular bone was decalcified and embedded in paraffin as using a general method. The specimens were sectioned and stained with Mallory`s anilline blue and observed light microscopically. The results were as follows. 1. In all groups, the proportion of cortex to total bone area was not significantly different. 2. In ovariectomized(OVE) group, the proportion of marrow cavity to medullary bone area increased significantly from 5 to 7 weeks (p<0.05). In ovariectomized and estrogen-injected(OVE-EST) group, it decreased significantly at 7 weeks, and in estrogen-injected(EST) group, it decreased significantly from 6 weeks(p<0.05). 3. Microradiogram and histopathologic findings revealed that marrow cavity was enlarged and osteoclasts were observed around irregular bone surface in OVE group. In OVE-EST group, the size of marrow cavity at 7 weeks was similar to that of control group. In EST group, as dense trabecular bone increased from 5 to 7 weeks, marrow cavity decreased.

코발트 담지 카본블랙 촉매를 이용한 아세트알데히드 산화반응

서성규,윤형선 國立 麗水大學校 環境問題硏究所 2002 環境硏究論文集 Vol.5 No.-

This study was performed to investigate the possibility of acetaldehyde oxidation on Co/carbon black catalyst. The experiment was conducted at the reaction temperature of 200~440℃, the acetaldehyde concentration of 0.94mole% in air and the cobalt loading amounts of 2~60wt%. The characterization of the carbon black and Co/carbon black catalyst was carried out by TGA and XRD analysis. The thermal characteristics of the carbon black was stable to the high temperature(600℃). XRD result showed that Co/carbon black were destroyed and new metal oxide were formed such as Co_(3)O_(4). Co_(3)O_(4) crystallite addition on the catalysts surface provided the greatest enhancement of the catalytic activity. The order of activity on acetaldehyde oxidation was summarized as follow: SiO_(2)<TiO_(2)<carbon black<SiO_(2)-Al_(2)O_(3). It was found from the experimental results and the economic consideration that carbon black could effectively be utilized as a support for acetaldehyde oxidation. The activity of Co/carbon black catalyst were varied with the cobalt loading amount and the optimum loading content of cobalt was found 10wt%.

ZrO₂-CaO계의 침전생성상에 미치는 pH효과

이형복,정윤중,김진규 明知大學校 産業技術硏究所 1988 産業技術硏究所論文集 Vol.7 No.-

The crystal phase of 1000℃ calcined powder, which was coprecipitated from the mixed solution of ZrOCl₂-8H₂O and CaCl₂- 2H₂O was detected by the DTA, XRD and SEM. At that time the mixed solution was varied with ZrO₂/CaO mole ratio, i.e. ZrO₂/CaO=0.7/0.3, ZrO₂/CaO=1/1 and ZrO₂/CaO=0.3/0.7. And also the pH value was controlled with NH₄OH solution as 2,4,6,8,10 and 12, respectively. Each system had the behavior of the formation of monoclinic ZrO₂ with tile lower pH value. The former two system showed the formation orthorhombic CaZrO₃ when the pH was 10 and 12. But at the system ZrO₂/CaO=0.3/0.7, the little amount of cubic ZrO₂ crystal phase was detected to coexist with the orthorhombic CaZrO₃ at pH 12.

금속-프탈로시아닌 촉매의 물리.화학적 특성

서성규,윤형선 麗水大學校 産業基術硏究所 1999 産業基術硏究所 論文集 Vol.8 No.-

Physico-chemical properties of metal-phthalocyanines(PC) with several pretreatment conditions were characterized by TG/DTA, EA, UV-Vis, SEM and XRD analysis. Also, catalytic activities of metal-phthalocyanines with pretreatment conditions were examined by methanol combustion. The effect of pretreatment conditions on catalytic activity was discussed in this paper. The catalytic activity of metal-phthalocyanine pretreated with air and CH₃OH, mixture at 450℃ for 1hr was excellent. Under this pretreatment condition, the basic structures of Cu(α)-PC and Co-PC were destroyed, and formed a new metal oxides such as CuO and CO₃O₄, respectively. But Zn-PC was retained its basic structure in this pretreatment condition. The order of catalytic activity on methanol combustion was summarized as follow: Co-PC> Cu(α)-PC> Fe-PC> Zn-PC.

코발트 프탈로시아닌 촉매를 이용한 메탄올의 연소특성

서성규,윤형선 여수대학교 1998 論文集 Vol.13 No.2

The catalytic combustion of methanol as a model volatile organic compound has been investigated over metallo-phthalocyanine(PC) catalysts in a fixed bed flow reactor system at atmospheric pressure. The catalytic activity was examined with reaction temperature: 200∼350℃, methanol(CH3OH): 2.29∼2.35mole% in air, contact time(W/F):0.62∼3.11 g-cat·hr/g-mol. The order of catalytic activity is summarized as follows: metal free-PC<Zn-PC<Fe-PC<Cu(a)-PC<Co-PC. The pretreated cobalt phthalocyanine catalysts have been characterised by TG/DTA. EA and XRD analysis. The catalytic activity pretreated with air and methanol mixture, 450℃, 1hr was very excellent. Under this pretreatment condition, the change from cobalt phthalocyanine(Co-PC) catalyst to new cobalt metal oxide(Co3O4) was confirmed by EA and XRD analysis. This cobalt metal oxide has high catalytic activity on methanol combustion.

VOC 연소에 대한 구리 프탈로시아닌의 촉매활성

서성규,윤형선 여수대학교 1998 論文集 Vol.12 No.2

The catalytic combustion of methanol as a model volatile organic compound has been investigated over copper phthalocyanine catalyst in a fixed bed flow reactor at atmospheric pressure. The catalytic activity for pretreatment effect was examined at reaction temperature: 200~380℃, methanol: 2.35mol% in air, contact time (W/F): 3.11g-cat.hr/g-mol. The pretreated copper phthalocyanine catalysts have been characterised by TG/DTA, XRD, FT-IR and EA analysis. The catalytic activity pretreated with air and Ch₃OH mixture, 450℃, 1hr was very excellent. Under this pretreatment condition, the change from copper phthalocyanine catalyst as organic metal to some new copper oxide was confirmed by various instrumental analysis. Also, the order of catalytic activity is summarized as follows: metal free-PC<Cu(α)-PC<Cu(β)-PC.

고출력 CW Nd:YAG 레이저를 이용한 CSP 1N 박판재 절단시 공정변수의 절단표면특성에 미치는 영향

안동규,김민수,이상훈,유영태,박형준 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-

The objective of this research work is to investigate the influence of process parameters, such as power of laser, travel speed of laser and material thickness, on roughness and striation of the cut surface for the case of cutting of CSP IN sheet using high power Nd:YAG laser with continuous wave (CW). In order to find the practical cutting region and the relationship between process parameters on the roughness and the striation, several laser cutting experiments are carried out. From the results of experiments, the allowable cutting region and an optimal cutting speed for each cutting condition have been obtained to improve the quality of the cut surface. In addition, it has been shown that the surface roughness is related to the number of striation and depth of valley of the cut surface.

국어의 음운변화와 보수성의 문제

김형규 세종대학교 1984 세종대학 논문집 Vol.11 No.-

There is a rule of conservatism in korean sound change. We can find itin the historical change of korean word form (sound change). For example (Ⅰ-1) k∧lg∧ (powder>k∧1-o(zero)>kau,(Ⅱ-1)molgæ(sand)>mol-æ>moræ. These sound changes occur becauses of the rule whereby the /g/ sound is lost between voiced and open sounds in korean as well as in other languages. But the formof k∧1-o(zero) andmol-æ in middle korean is irregular. These words must be k∧r∧ (karu) mnræ as in present-day korean. However, kal-o(zero) and mol-æ were used for several hundred years in middlekorean. The remnant of /g/ has remained in its orignal place and resisted the sound change 1→r. There were some endings in mdidle korean (Ⅱ-3) /-g??nil/:/-??nil/:/-j??nil/, and /-??nil/ changed from /-g??nil/ as a result of the loss of the /g/ sound. However because of the residual /g/ sound there was no gliding, nevertheless /-j??nil/ as the result of gliding changed from /-??nil/. The same explanation applies to (Ⅱ-3) /-g??∫inil/:/-??∫inil/:/-j??∫inil/ etc. The /t,t^h/ sounds change to /+∫, +∫^h/ by palatalizatin when followed by /i,j/. But (Ⅲ-1) '??di' (where), tidida (step on) have no palatalizatin. These words were originally '??dii' and 'didiida' Here ihe residual /i/ sound resists phonological change. The word (Ⅲ-2) muni (pattern) is also same. We can see this phenomenon in the compound word (Ⅳ-1) 'pj??-∫'i' (rice seed)→'pj??p-∫'i'. In this case we must point out the fact that the original word form of '∫'i' (seed) was 'p∫i' and the /p/ initial sound was preserved in this compound word. (Ⅳ-2) su-kæ(male dog)→su-k^hæ', in this change, 'su' (male) was originally 'suh' and the /h/ final sound is preserved in this compound word. Therefore, we can say that there is a phonological rule in korean that the sounds lost in sound change remain in vestigal form and resist subsequent sound changes or reappear in some compound words.

만성 신부전증 환자의 중중 고혈당에 따른 의식 변화 결정에 대한 연구

위형중,이창범,박성광,강성귀,임천규,박은주,윤경택,한상웅,안유헌,김호중· 대한신장학회 2000 대한신장학회잡지 Vol.19 No.6

표백에 의한 라디에타소나무의 청변 제거

김규혁,김형준,나종범,김재진 한국목재공학회 2003 목재공학 Vol.31 No.1

본 연구는 라디에타소나무 제재목의 균 변색을 제거하기 위한 표백처리의 사용 가능성을 조사하기 위하여 수행하였다. 염소계 표백제인 아염소산나트륨과 차아염소산나트륨은 표백조건(약제농도, 처리온도, 처리시간)의 조절에 따라 만족할만한 변색제거 효과를 얻을 수 있었다. 비염소계 표백제인 과산화수소는 표백조건의 조절만으로는 변색제거가 불가능하였으나 규산나트륨과 수산화나트륨을 활성제로 첨가하는 경우에는 염소계 표백제보다 탁월한 변색제거 효과를 나타내었다. 그러나 활성제 첨가에 따라 재색의 녹색화 문제가 발생하였는데, 앞으로 이러한 문제점을 해결하기 위한 연구가 진행되어야 할 것이다. 또한, 앞으로 본 연구를 통해 개발된 변색제거방법의 현장 적용을 후속 연구도 필요하다고 본다. The feasibility of using bleaching treatments for removing fungal stain was evaluated on heavily stained raiadta pine sapwood. Sodium chlorite and sodium hypochlorite appeared to destain fungal discoloration by providing proper treatment conditions (chemical concentration, treatment temperature, and treatment time), while hydrogen peroxide did not remove fungal stain under the bleaching regimes evaluated. The addition of sodium silicate and sodium hydroxide in the hydrogen peroxide solution as a buffer could remove fungal discoloration completely:; however, the color of wood surface turned faint green after bleaching, thereby reducing the lightness of bleached samples. The results suggest that hydrogen peroxide bleaching could be a feasible method for removing fungal discoloration of stained radiata pine sapwood, although further research is needed to solve the problem of color change after bleaching Also, further tests under field conditions are recommended.