인공타액 오염이 수종 상아질접착제와 상아질간의 결합에 미치는 영향

오원만,양규호,류미애 大韓齒科保存學會 1992 Restorative Dentistry & Endodontics Vol.17 No.2

The purpose of this study was to evaluate the influence of artificial saliva contamination on bonding of several dintin adhesives to dentin. Sixty-three human molar teeth extracted within a month were used. Each tooth was sectioned longitudinally in a buccolingual direction to obtain 126 wpecimens. These specimens were randomly divided into three froups and were treated by Scotchbond 2, Gluam and All vond. Each group was subdivided into three subgroups; normal group not contaminated with artificial saliva, contaminated with artificial saliva and dried group, and contaminated with artificial saliva and washed and dried group. Enamel/dentin bonding agent (Dental Adhesive of Scotchbond 2) was applied light cured on the treated dentin surfaces. Threrafter P-50 were cured on them, and specimens were storde in 37℃ artificial saliva for 24 hours before measuring shear bond strength. Shear bond strengths were determined using an universal testing machine with cross head speed 1mm/min and SEM examinations were conducted to evaluate the resin-dintin interface and degree of penetrating resin string into the dentinal tubules. The following results were obtained. 1. Normal gropqs ont contaminated with artificial saliva showed greater shear bond streagth than any other group contaminated with artificial saliva)P<0.01). 2. The shear bond strengths showed no significant difference between washed groups with distilled water and ont washed groups after contamination with artificial saliva(P>0.05). 3. In normal groups, the shear bond strength of A group was significantly greater than in any other group(P<0.01). 4. In S and G groups, fractrues after shear bond strength tests occured adhesively on resintooth interface in all specimens. But in A groups, fractrue of the normal group occured cohesively in dentin and fractrue of the contaminated groups coourde adhesively and cohesively. 5. On SEM examination, the number of resin strings penotrated into dentinal tubules were the greatest in normal groups, followed by, in descending oredr, wasghed groups and not washed groups after contamination with artificial saliva.

버팀보로 지지된 흙막이벽의 거동에 관한 연구

홍원표,여규권,윤중만,조용상 중앙대학교 기술과학연구소 1997 기술과학연구소 논문집 Vol.27 No.-

버팀보 축력으로부터 산정된 측방토압은 지표면에서 굴착깊이의 17%에 해당되는 깊이까지 선형적으로 증가하다가 그 깊이 아래로부터는 일정토압분포를 보이는 사다리꼴모양의 분포를 보였다. 이 일정토압 분포부분의 토압 크기는 평균적으로 최종굴착깊이에서의 Rankine 주동토압의 58%에 해당하거나 연직상재압의 17%에 해당하였다. 또한 흙막이벽의 수평변위와 굴착깊이와의 관계로부터 흙막이구조물의 안정성을 판단할 수 있는 시공관리기준을 설정하였다. 흙막이벽의 수평변위량이 굴착깊이의 0.20%보다 작으면 흙막이벽과 굴착배면지반은 안정된 상태에 있다. 그러나 벽체의 수평변위가 굴착깊이의 0.20%보다 크게 발생하면 굴착공사의 안정성을 주의깊게 관찰해야만 하며, 필요하다면 흙막이 구조물을 보강해야만 한다. The lateral earth pressures on braced earth retaining walls, which are estimated form the measured strut force, shows a trapezoidal distribution that the earth pressure increases linearly with depth from the ground surface to 17% of the final excavation depth, and then keeps constant value. The maximum lateral earth pressure was same to 58% of Rankine's active earth pressure or 17% of the vertical overburden pressure at the final excavation depth. Also, empirical criterion is established for construction management to monitor and ensure the stability of deep excavation from the relationship between horizontal displacement of wall and excavated depth. If the horizontal displacement of wall measured from inclinometer shows less than 0.20 percent of the excavated depth, the retention wall and surrounding ground exist under stable state. When the horizontal displacement is developed more than 0.20 percent of the excavated depth, excavation works should be carefully observed and reinforced the earth retention wall, if necessary.

포도상구균 폐렴을 동반한 고면역글로불린 E 증후군 1례

오흥원,서원석,신상만 순천향의학연구소 1995 Journal of Soonchunhyang Medical Science Vol.1 No.1

The hyperimmunoglobulin E syndrome is a rare primary immunodeficiency disorder characterized by extremely high serum IgE levels and eosinophilia, and serious recurrent bacterial infections of the skin and sinopulmonary tract in early life. Associated clinical features are coarse facial appearance and chronic eczematoid dermatitis. The most common organism that infect these patients are S. aureus and C. albicans. The patients' serum IgE levels are elevated but the basic immunologic mechanism is not fully understood. It is believed that the elevated IgE levels reflect a T-cell imbalance characterized by T-cell activation and a deficiency of suppressor T cells to inhibit IgE production. We have experienced a case of hyperimmunoglobulin E syndrome in a ??-year-old boy who had suffered from recurrent staphylococcal pneumonia and onychomycosis and chronically pruritic dermatitis from 3 months of age with elevated serum IgE level. A brief review of the related literature is presented.

탈회골기질 이식에 대한 치수세포의 반응에 관한 실험적 연구

오원만,김민선,김선헌 大韓齒科保存學會 1995 Restorative Dentistry & Endodontics Vol.20 No.2

용량형 센서를 위한 용량차-시간차 변환기

정원섭,박지만 청주대학교 산업과학연구소 2000 産業科學硏究 Vol.17 No.2

A novel capacitance deviation-to-time interval converter based on ramp-integration is presented. It consists of two current mirrors, two schmitt triggers, and control digital circuits by the upper and lower sides, symmetrically. Total interface circuit has been with discrete components. The results have shown that the cacpacitance deviation has linearily time interval(pulse width). Therefore, the high-resolution can be known by counting the fast and stable clock pulses gated into a counter for time interval. The presented circuit is insensitive to the capacitance difference in disregard of voltage source or temperature deviation. Besides the accuracy, it features the small MOS IC device count integrable onto a small chip area. The circuit is thus particularly suitable for the on-chip, interface.

치수에서 Eugenolol iCGRP(immunoreactive calcitonin gene-related peptide)의 분비조절에 미치는 영향

오원만,최남기,김선헌 大韓齒科保存學會 1999 Restorative Dentistry & Endodontics Vol.24 No.1

백서 척수에서 Capsaicin과 Eugenol이 iCGRP (immunoreactive calcitonin gene-related peptide) 분비 조절에 미치는 영향

오원만,김원재,최남기,박상원,황인남,김선현 大韓齒科保存學會 2001 Restorative Dentistry & Endodontics Vol.26 No.5

Neuropeptide such as calcitonin gene-related peptide and substance P may mediate neurogenic inflammation, but little is known about the regulation of neuropeptide release from rat spinal cord. Eugenol has been reported to reduce odontogenic pain and is known to have a structure similar to capsaicin, a potent stimulant of certain nociceptors. This study was done to examine the effect of capsaicin and eugenol on immunoreactive calcitonin gene-related peptide (iCGRP) release from rat spinal cord and whether eugenol regulates capsaicin-sensitive release of iCGRP or it evokes capsaicin-sensitive release of iCGRP. The dorsal half of rat lumbar spinal cord was chopped into 200㎛ slices. They were superfused (500㎕/min) in vitro with an oxygenated Kreb's buffer. The EC50 of capsaicin on iCGRP release was measured. Eugenol (600㎛ and 1.2mM) and vehicle (0.02% 2-hydroxyl-β-cyclodextrin) were administered prior to stimulation of rat lumbar spinal cord with capsaicin. The amount of iCGRP release from rat lumbar spinal cord was measured by radioimmunoassay. The results were as follows : 1.iCGRP release from rat lumbar spinal cord was dependent on concentration of capsaicin. The EC50 of capsaicin on iCGRP release was 3㎛. 2.In the vehicle treated group, capsaicin (3㎛) evoked a 14-fold increase over basal iCGRP level. 3. Administration of 600㎛ and 1.2mM eugenol evoked a 2.2-fold increase and a 2.3-fold increase over basal iCGRP level respectively. 4.Administration of 600㎛ and 1.2mM eugenol increased capsaicin evoked release of iCGRP by more than 50%. These results indicate that eugenol evoke CGRP release from central nervous system and potentiate the pain-inducing action of capsaicin on it Key words : Eugenol, Capsaicin, Rat lumbar spinal cord, Superfusion, Radioimmunoassay

劉宋 顔謝 詠史詩의 성격 규명을 위한 論考 : <五君詠>과 <의위태자업중집시팔수>를 대상으로

金萬源 韓國中國語文學會 1990 中國文學 Vol.18 No.-

초기 방습이 글래아이오노머 시멘트의 색안정성 및 투명도 변화에 미치는 영향

오원만,김선헌,정선와 大韓齒科保存學會 1994 Restorative Dentistry & Endodontics Vol.19 No.1

韓國의 암발파 진동상수에 관한 연구

홍원표,엄영진,윤중만 중앙대학교 기술과학연구소 1995 기술과학연구소 논문집 Vol.25 No.-

암반지반에서 절토나 지하굴착을 실시할 때 암발파로 인해 진동과 소음이 발생하게 된다. 지반진동은 인접구조물에 손상을 주거나 인근주민에게 불쾌감을 주기 때문에 지반진동의 발생기구나 인접구조물에 영향을 미치는 매카니즘을 정확히 예측하는 것은 매우 중요하다. 따라서 본 연구의 목적은 지반진동에 대한 규준을 마련하는데 있다. 지반진동은 최대입자속도, 발파에너지, 진동원으로 부터의 거리에 영향을 받는 것으로 나타났다. 또한, 본 연구에서 산정된 진동식의 최대입자속도는 기존의 제안식보다 약간 작게 나타나고 있으나 진동원으로부터 50~100m 이내의 거리에서는 매우 유사하게 나타나고 있다. Vibration and noises are occured dut to rock blasting work for cutting and underground excavation performed in rock ground. It is very important to control the vibration produced according to rock blasting. Therefore, the main objective of this paper is to estabilish criteria of vibration to control blasting. Vibration is influnced by peck particle velocity, blasting energy, distance from vibration source and strength of rock. The peck particle velocities estimated by the vibration equations presented in this paper are lower than those estimated by existing empirical equations but both show very similar within distance from 50m to 100m.