HGCMP기반 서버 시스템상의 전달지연 연구

조현주,김한수,이광휘 昌原大學校 基礎科學硏究所 1995 基礎科學硏究所論文集 Vol.7 No.-

In this thesis, the message transmission delay on a server system using HGCMP for group communication protocol was analyzed. The queue model of a server system was modeled by queueing theoretic approach. As the feedback structure was imbedded in the queue model, it is difficult to analyze the delay. To solve this problem, the simplification of the queue model was performed. After the simplification process, the queue model was modeled M/M/1. The transmission delay of a server system is calculated using average waiting time and service time in a server system.

Trirutile type 고체촉매를 이용한 olefin의 에폭시화 반응에 관한 연구

조영범,안광현 慶熙大學校 材料科學技術硏究所 2000 材料科學技術硏究論集 Vol.13 No.-

과산화수소를 이용한 알켄의 산화 반응에서 trirutile type 고체 산화물이 효과적으로 촉매 역할하는 것을 관찰할 수 있었다. 특별히 HNbMoO_(6), LiNbMoO_(6) 및 HNbWO_(6)등이 좋은 촉매효과를 보여주었다.

광학적 측정을 이용한 정밀 스테이지 위치오차의 실시간 측정 방법에 관한 연구

조웅,현광익,김종형 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-

This paper suggests method to measure that error of the precision stage is used precision process and measurement equipment by using camera optics. Though laser interferometer measures position error of stage when precision stage is manufactured by us or it is used to measure stage for the nonce as a general rule, optics tooling position measurement method to suggest is possible to apply in real-time and trace an error range continually. Therefore it is able to improve capabilities of equipment by compensating an error range when operates precision process and measurement equipment in real-time.

심실중격결손증-치험 1예-

조광현,우종수,황윤호,이양행,박철호,김종성,김철호,이경순,조영일,박태인 인제대학교 1985 仁濟醫學 Vol.6 No.4

A successful treatment of infants and children with congenital heart defects depends upon several factors: diagnosis must be accurate, the operative technique, including techniques of perfusion and myocardial preservation, must be suited to the needs of patients and intensive cares, including accurate anesthesia, must be applied through all stages of investigation and treatment, i.e. before, during and after the operation. Recently we performed a open heart surgery successfully for a six-years old girl who had suffered from frequent upper respiratory tract infection and mild to moderate exertional dyspnea with congenital heart defects (ventricular septal defect, Kirklin type II, with patent foramen ovale). The operation and postoperative course were very smooth. And now we report this with review of literatures.

심장수술 2,450예와 심장이식

조광현,황윤호,이양행,류지윤 인제대학교 1999 仁濟醫學 Vol.20 No.1

Nd:YAG 레이저 조사와 불화물 도포가 탈회법랑질의 재광화에 미치는 영향

조현,이광희,김대업 大韓小兒齒科學會 2004 大韓小兒齒科學會誌 Vol.31 No.3

Normal pulsed Nd:YAG 레이저 조사와 불소화합물이 산성음료수에 의해 탈회된 법랑질의 표면 미세경도에 미치는 재광화 효과를 평가하고자 한다. 법랑질 시편을 제작하여 50ml 플라스틱 시험관 5개에 코카콜라를 채운 후 30개의 소구치를 6개씩 나누어 넣고 탈회시켰다. 법랑질 표면에 6W 출혁하의 50mJ 에너지 밀도, 20Hz의 pulse rate로 레이저를 조사하였다. 레이저가 조사된 법랑질 표면에 각 군별로 여러 형태의 불소화합물을 처리한 후 탈회 전, 후의 미세경도 및 Diagnodent를 측정하였다. 동일한 방법으로 탈회된 법랑질에 레이저를 조사했을 때와 레이저가 조사된 법랑질 표면에 불소화합물을 처치한 후에 미세 경도 및 Diagnodent를 측정하였다. 법랑질 표면을 산성 음료에 탈회 후, 레이저 조사 후, 불소화합물 처치 후의 각각의 시편에 대하여, 주사전자현미경으로 1500배 확대하여 관찰하였다. 1. 산성 탈회된 법랑질 표면의 미세경도(VHN)가 레이저를 조사한 수와 불소 도포 후에 증가하였으나, 레이저 조사 후의 경도와 불소 도포 후의 경도간의 차이는 유의하지 않았다. 2. 초기 경도, 탈회 후 경도, 레이저 조사 후 경도, 불소 도포 후 경도에서 불소군 간의 차이는 모두 유의하지 않았고, 불소 용액 군과 불소 젤 군에서는 레이저 조사 후의 경도와 불소 도포 후의 경도 간에 유의한 차이가 없었으나, 불소 바니쉬군에서는 유의한 차이가 있었다. 3. Diagnodent 측정치의 변화에서 초기 점수, 탈회 후 점수, 레이저 조사 후의 점수와 불소 도포 후의 점수 간에는 유의한 차이가 있었고, 레이저 조사 후 점수와 불소 도포 후의 점수가 불소 도포 군 사이에서는 유의한 차이가 없었다. 4. 산성 음료수에 탈회된 법랑질 표면에의 Nd:YAG 레이저 조사는 재광화에 효과적이며, 불소화합물의 처치는 레이저의 효과를 증가시키는 부가적인 효과를 갖는다. 5. 주사 전자 현미경상에서 Nd:YAG 레이저가 조사된 법랑질 표면은 전체 표면이 법랑소주가 녹아내려 융합된 매끈한 바닥에 균열이 생기고 분화구가 퍼져 있는 양상을 보였으며, 불소 도포 후에는 균열과 분화구 형태는 뚜렷하지 않으며 탈회된 후의 표면에 가까운 양상을 보였다. The purpose of this in vitro study was to investigate the effects of Nd:YAG laser irradiation and fluorides on acid demineralized enamel. The materials were 30 freshly extracted permanent premolars with intact smooth enamel surfaces. They were demineralized with Coca-cola at 37℃ for 12 hours and then irradiated by Nd:YAG laser with 6W power, 50mJ/㎠ energy density, and 20Hz pulse repetition. After laser irradiation, teeth were treated by three kinds of fluorides; (1) 0.05% NaF fluoride solution (2) 1.23% APF gel and (3) 0.1%F fluoride varnish, microhardness(VHN) and Diagnodent scores were measured and the surfaces of each treated specimens were also observed with SEM under 1500 magnification. The results were as follows: 1. In the change of microhardness(VHN), it decreased to 34.68% from the initial micrhardness, increased to 78.37% after laser irradiation and increased to 82.62% after fluoride treatment, there were significant differences except when it was irradiated and treated with fluoride(P<0.05). 2. In the change of Diagnodent scores, it was decreased to 28.08% from the initial scores after demineralization, and then increased to 59.81% after laser irradiation, and increased to 82.17% after fluoride treatment. Scores were different significantly between the scores of initial, demineralization, laser irradiation and fluoride treatment (P<0.05). All the scores were not different significantly between fluoride types. 3. SEM observation showed that the lased enamel surfaces after demineralization were thermally degenerated and showed molten lava-like appearance and crater with cracks and many microholes.

대기 현상에 대한 초등학생의 선개념 및 오개념 분석

조현희,김광명 춘천교육대학교 과학교육연구소 2001 과학교육연구 Vol.24 No.-

호스피스 시설의 유형별 공간구성에 관한 건축 계획적 연구

조광현,박재승 한국의료복지시설학회 2002 의료·복지 건축 Vol.8 No.1

Recently cancer, AIDS, chronic sickness have increased according to the elevation of socioeconomic level and fast change of lifestyle. The number of patients receiving terminal care increased fairly because the span of life is extended by development of medicinal technology. Also necessity of hospice and palliative care was risen according to the request of terminal patients that remove pain and keep calm life by interest about quality of life, However architectural plan and type specialization of facility which can correspond team's composition and supplied nursing program are not consisting. This study researches about care environment of hospice facility plan through investigation into terminal patient's special quality. The purpose of this study is to propose fundamental datas of hospice facility for architectural plan through comparative analysis of cases of domestic and outside facilities.

CAD/CAM 으로 제작된 Ceramic Inlay의 변연누출에 관한 비교연구

조병훈,이명종,임미경,이광원,손호현 大韓齒科保存學會 1997 Restorative Dentistry & Endodontics Vol.22 No.2

To compare the marginal leakage of CAD/CAM-fabricated ceramic inlay, gold inlay and amalgam, forty extracted caries-free premolars were prepared with Class Ⅱ MO cavity design. The teeth were divided into four groups of ten samples each. Group 1 was restored with CAD/CAM-fabricated ceramic inlays cemented with Scotchbond Resin Cement / Scotchbond Multi-purpose plus. Group 2 was restored with gold inlays cemented with Scotchbond Resin Cement / Scotchbond Multi-purpose plus. Group 3 was restored with gold inlays cemented with zinc phosphate cement. And, Group 4 was restored with amalgam. All samples were thermocycled, and stored in 1% methylene blue. Marginal leakage was examined at four margins, that is, occlusal distal, priximal gingival, occlsal facial and occlusal lingual margins from sectioned samples under steeomicroscope(x15). The results were as follows: 1. Group 1 and 2 showed no statistically significant difference among marginal leakage at all four examined margins(p>0.05). 2. Group 3 and 4 showed significant marginal leakage at proximal gingival margin compared with other margins(p<0.05). 3. Significantly increased marginal leakage at priximal gingival, occlusal facial and occlusal lingual margins in group 3 were observed compared with other groups(p<0.05).

원예작물의 염류장애 원인과 대책을 위한 생리, 생화학적 연구 3.토마토 뿌리조직에서 마이크로솜 Ca²+ uptake 특성연구

조광현,김영기 충북대학교 한국과학재단 지정 첨단원예기술개발 연구센터 1998 연구보고서 Vol.3 No.-

식물세포의 세포질 Ca²+ 이동과 관련된 Ca²+ transport 특성을 조사하기 위하여, 토마토 뿌리조직으로부터 마이크로솜을 분리하고, 45Ca²+ uptake 실험을 수행하였다. 반응용액에 Ca²+-ATPase의 선택적 저해제인 1 mM vanadate와 액포막 H+-ATPase의 선택적 저해제인 50 mM NO₃를 각각 첨가하였을 때, 45Ca²+ uptake는 각각 20%와 30% 저해되었고, 두 가지 저해제를 동시에 첨가하였을 때 50% 저해되었다. 또한 마이크로솜 45Ca²+ uptake는 vanadate 또는 NO₃-의 농도를 증가시킴에 따라 저해되었다. 이러한 저해효과는 토마토 뿌리조직 마이크로솜에 Ca²+-ATPase와 Ca²+/H+ antiport가 동시에 존재할 가능성을 시사한다. Protonophore인 gramicidin의 처리에 의해 45Ca²+ uptake는 30% 가량 저해되어, 토마토 뿌리조직 마이크로솜에 Ca²+/H+ antiport가 존재하고 있음을 확인하였다. NO₃-를 처리하여 45Ca²+ uptake를 저해시킨 후 gramicidin을 처리하였을 때, gramicidin에 의한 추가저해는 거의 관측되지 않았으나, vanadate의 경우 gramicidin에 의한 추가저해가 현저히 나타났다. 이러한 결과는 토마토 뿌리조직 마이크로솜 45Ca²+ uptake가 vanadate에 의하여 저해되는 Ca²+-ATPase와 NO₃-에 의하여 저해되는 Ca²+/H+ antiport에 의해 이루어지고 있음을 의미한다. 한편, 동물조직 ER/SR-type Ca²+-ATPase의 특이성 높은 선택적 저해제인 thapsigargin은 마이크로솜 45Ca²+ uptake를 농도 의존적으로 저해하였으며, 10μM 농도에서 최대저해효과를 나타냈다. Thapsigargin에 의한 45Ca²+ uptake의 저해효과는 NO₃를 사용하여 액포막 H+-ATPase 활성을 저해하였을 때 현저하게 감소하였다. 반면, vanadate를 처리하여 원형질막 H+-ATPase의 활성을 저해한 후에도 thapsigargin에 의한 추가적 저해효과가 관측되어 thapsigargin이 액포막 H+-ATPase의 활성을 저해하여 간접적으로 Ca²+/H+ antiport를 저해함을 확인하였다. 이상의 결과들은 토마토 뿌리조직 마이크로솜에 Ca²+-ATPase와 액포막 Ca²+/H+ antiport가 존재하며, thapsigargin이 액포막 Ca²+/H+ antiport를 선택적으로 저해함을 보여준다. In order to characterize the property of Ca²+ transport in plant tissue, microsomes were prepared from the roots of tomato and microsomal 45Ca²+ uptake was measured. When 1mM vanadate, a selective inhibitor of P-type ATPases, 50 mM NO₃, a specific inhibitor of vacuolar H+-ATPase, and both of these inhibitors were treated, the microsomal 45Ca²+ uptakes were inhibited by 20%, 33%, and 47%, respectively. The inhibitory effects of these two inhibitors were investigated by using a protonophore, gramicidin. When the chemical gradient of H+ was relieved by gramicidin, the uptake was decreased by 30%, implying the presence of Ca²+/H+ antiporter in the microsomal membrane. In the 45Ca²+ uptake experiment, the effect of gramicidin was independent of vanadate-induced inhibition. However, when the activity of vacuolar H+-ATPase was inhibited by NO₃, the effect of gramicidin was severely decreased. Meanwhile, thapsigargin, a specific antagonist of ER/SR-type Ca²+-ATPase, inhibited the microsomal 45Ca²+ uptake and the maximum inhibitory effect was obtained at 10μM. The effect of thapsigargin was blocked by NO₃and gramicidin, but not by vanadate. These results imply that vanadate directly inhibits the activity of Ca²+-ATPase; however, NO₃- and thapsigargin block the activity of Ca²+/H+ antiporter by inhibiting the vacuolar H+-ATPase. In conclusion, the microsomal 45Ca²+ uptakes are mediated by two major enzymes, Ca²+-ATPase and Ca²+/H+ antiporter in tomato root tissue.