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이상윤,라병욱,박동수,황인헌,이덕동,신영남,박성배,이동욱,박용석,박형근,손상호,권태근,채경락,정경득 慶北大學校 自然科學大學 1986 自然科學論文集 Vol.4 No.-
An Ac-type Plasma Display Panel (PDP) operating with Ne-Ar(0.1%) Penning mixture gas is fabicated. The characterics of the panel with electrodes covered with thin and thick dielectric layers are studied. The brightness of the Neon-orange light emitted by the panel measured as function of applied voltage and frequency. As an application, a graphic display system equipped with PDP showing still and moving pictures is made.
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羅炳旭,李相潤,朴德圭,李鍾德,禹洪,盧景錫 慶北大學校 物理化學硏究所 1982 硏究論文集 Vol.3 No.-
1. Ti/p-Si Solar cell Fabricated by Vacuum Evaporation Titanium thin film was deposited on the chemically etched (100) surface of silicon single crystal by the vacuum evaporation. The interfacial oxide was grown by ramp heating. The Ti/p-Si solar cells have shown good rectification properties with the 0.78 V built-in potential and the 20 ㎂/㎠ reverse saturation current density in dark. The best cell have 0.58 V open circuit voltage, 38.0 ㎃/㎠ short circuit photocurrent density 0.64 fill factor and 13.9 % energy conversion efficiency under 100 ㎽/㎠ tungsten halogen lamp irradiation. Therefore, this solar cell is a very promising one, but the life testing is not performed yet in out laboratory. 2. Al/p-Si Solar Cell with Fine Grid and Inversion Layer The fabrication procedure and properties of MIS inversion solar cells forming a fine grating pattern of aluminium evaporated onto p-type silicon single crystal are discribed. The finest grating line width achieved in these cells described here were about 30 ㎛, and the smallest spacings were about 120 ㎛. The proper temperature for oxide growing of these cells was found to be about 450℃ for 20 minutes with oxygen flow. Under 100 ㎽/㎠ of irradiation of sunlight and using the antireflective coating of tnataliumsilicafilm spun on these cells, the short circuit photocurrent density, open circuit voltage and energy conversion efficiency were 28.0 ㎃/㎠, 0.545 V and 11 % respectively. 3. Heterojunction Type Solar Cell In_2O_3: Sn and SnO_2 films were deposited on the (100) surface of silicon single crystal by the spray pyrolysis method. The properties of these cells have good rectification with open circuit voltage, the short circuit photocurrent density, fill factor and energy conversion efficiency of 0.52V, 39.3㎃/㎠, 0.63 and 12.9 %, for In_2O_3: Sn/n-Si heterojunction solar cell and of 0.45V, 35.5 ㎃/㎠, 10.2%, for SnO_2/n-Si cell, respectively.
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와동의 형태가 상아질과 복합레진 사이의 미세인장결합강도에 미치는 영향
김예미,박정원,이찬영,송윤정,서덕규,노병덕 大韓齒科保存學會 2008 Restorative Dentistry & Endodontics Vol.33 No.5
이 실험의 목적은 동일한 깊이의 상아질에서 제 6세대의 self-etching system을 사용하여 C-factor가 상아질과 복합레진 사이의 미세인장결합강도에 미치는 영향을 알아보는 것이다. 건전한 대구치 80개를 선정하여 와동의 바닥면적은 각각 16㎟로 동일하게 하고 깊이를 조절하여 C-factor가 각각 0.25, 2, 3, 4인 4개의 군으로 나누었다. 각 군별로 총 20개의 치아를 할당하였으며 접착제와 복합레진의 조합에 따라 다시 4개의 소군에 치아 5개씩을 배정하였다. 상아질 접착제는 AQ Bond Plus또는 Xeno III를 사용하였고, 복합레진은 Fantasista또는 Ceram-X mono를 사용하였다. 제조사의 지시대로 상아질 접착제를 도포한 후 60초간 광중합하였다. 24시간 동안 증류수에 보관 후 단면적이 1.0 x 1.01㎟인 복합레진-상아질 beam을 형성하여 1 mm/min의 속도로 미세 인장결합강도를 측정하였다. One-way ANOVA와 Tukey test, 그리고 Pearson correlation test로 통계처리하여 다음과 같은 결과를 얻었다. l. Xeno III와 Ceram-X mono군에서는 C-factor가 증가할수록 미세인장결합강도가 유의하게 감소했으나 (p < 0.05), 나머지 재료군에서 C-factor군간에 미세인장결합강도의 유의한 차이가 없었다. 2. C-factor 3군에서는 AQ Bond Plus와 Fantasista군이 XenoIII와 Ceram-X mono군에 비해 높은 결합력을 보였으나 (p < 0.05), C-factor 0.25군, 2군, 4군에서 4가지 접착제와 수복 레진의 조합 간에 유의한 차이가 없었다. 3. Fantasista군에서 C-factor와 미세인장결합강도 사이에 일정한 상관관계를 발견할 수 없었고, Ceram-X mono군에서 C-factor가 증가할수록 미세인장결합강도가 감소하는 경향을 보였다 (p < 0.05). 이번 연구의 결과로 상아질의 깊이가 동일하고 6세대의 self-etching system을 사용하여 복합레진을 충전하는 경우와동의 C-factor가 수복물의 미세인장결합강도에 크게 영향을 미치지 않음을 알 수 있었다. This study was conducted to evaluate the influence of the C-factor on the bond strength of a 6th generation self-etching system by measuring the microtensile bond strength of four types of restorations classified by different C-factors with an identical depth of dentin. Eighty human molars were divided into four experimental groups, each of which had a C-factor of 0.25, 2, 3 or 4. Each group was then further divided into four subgroups based on the adhesive and composite resin used. The adhesives used for this study were AQ Bond Plus (Sun Medical, Japan) and Xeno III (DENTSPLY, Germany). And composite resins used were Fantasista (Sun Medical, Japan) and Ceram-X mono (DENTSPLY, Germany). The results were then analyzed using one-way ANOVA, a Tukey's test, and a Pearson's correlation test and were as follows. 1. There was no significant difference among C-factor groups with the exception of groups of Xeno III and Ceram-X mono (p < 0.05). 2. There was no significant difference between any of the adhesives and composite resins in groups with C-factor 0.25, 2 and 4. 3. There was no correlation between the change in C-factor and microtensile bond strength in the Fantasista groups. It was concluded that the C-factor of cavities does not have a significant effect on the microtensile bond strength of the restorations when cavities of the same depth of dentin are restored using composite resin in conjunction with the 6th generation self-etching system.
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수종 이원중합 레진 씨멘트의 중합률 및 세포 독성에 관한 실험적 연구
이정석,노병덕,박성호 大韓齒科保存學會 1995 Restorative Dentistry & Endodontics Vol.20 No.1
AbstractThe degree of conversion of composite resin was known to have influence on the mechani- cal properties of composite materials such as hardness, strength, wear resisitance, dimensio- nal and color stability. Also unreacted monomer was reported to be harmful to the pulp. So the degree of conversion was a very important factor in the success of composite resin restorations.In recent, the dual cure resin cement was developed with the advocations that it could increase the curing rates in the sites where the curing ligt could not reach. Moreover many manufactors added some adhesive components in the resin cement.This study was undertaken to observe the effects of curing depth and light curing times on the degree of conversion of dual cure resin cements. CR INLAY CEMENT, DUAL CEMENT and OPTEC BOND, by the Fourier transform Infrared analysis, changing the curing depth 1mm, 2mm and 3mm, and varying the light curing time 20 seconds, 40 seconds and 80 seconds at each depth. The cytotoxicity of dual cure resin cements was tested by the in vitro MTT method using L929 cell. The results was evaluated and compared statistically.The results were obtained as follows: 1. The dual cure resin cements reavealed various degree of conversion, CR INLAY CE- MENT and DUAL CEMENT had a tendency to be more reactive to the light cure and OPTEC BOND was a more chemical one. 2. CR INLAY CEMENT and DUAL CEMENT showed the lowest degree of conversion in 2 mm depth, and in 3mm depth the degree of conversion increased, which were due to the chemical cure of dual cures, but OPTEC BOND showed decreasing degree of conversion with increasing curing depth and all experimental groups showed lower degree of conversion than CHEMICAL group which cured in dark room with no light, so the weak light?uring of dual cure resin cement prevented the chemical cure. (P<0. 05) 3. CR INLAY CEMENT and DUAL CEMENT showed increasing degree of conversion in 1 mm and 3 mm, according to the increasing cure times, but in 2 mm depth the degree of conversion decreased with increasing light?uring times and OPTEC BOND showed contrary tendency, but there was no ststistical importance in the differences among the experimental group.(P>0.05) 4. The optical density by MTT assay of extractions of CR INLAY CEMENT, DUAL CE- MENT and OPTEC BOND revealed no statitically important differences comparing with optical density of negative control.(P>0.05) 5. CR INLAY CEMENT showed a tendency of increaing cytotoxicity with days and DUAL CEMENT and OPTEC BOND showed higher cytotoxicity in 2 days than in 4 days, but there was no statistical importance in the differences. (P>0.05)
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김유경,박성호,노병덕 大韓齒科保存學會 2012 Restorative Dentistry & Endodontics Vol.37 No.2
Complications resulting from condylar fracture include occlusal disturbance due to loss of leverage from temporomandicular joint (TMJ). In general, closed reduction with active physical training has been performed, and under favorable circumstances, adaptation occurs in attempt to restore the articulation.The patient in this case report had unilateral condylar fracture accompanied with multiple teeth injuries, but he was left without any dental treatment for 1 mon which led to unrestorable occlusal collapse. Fortunately, delayed surgical repositioning of dislocated maxillary anterior teeth followerd by consistent long-term physical training has been proved successful. Normal occlusion and satisfactory remodeling of condyle were obtained on 10 mon follow-up.
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내시경적 결찰술에 의한 Dieulafoy 병의 치료 3예
박성규,박병수,최호순,고정희,박강서,최우석,조병석,최덕례,안진형 대한소화기내시경학회 1994 Clinical Endoscopy Vol.14 No.3
Dieulafoy lesion is very small and easily overlooked as a course of massive, often recurrent hemorrhage that results from the crosion of a submucosal artery, typically in the gastric cardia or fundus. The clinical picture of Dieulafoy lesion is quite uniform: patients commonly present with massive hemorrhage and melena without any relevant history. The diagnostic procedure of choice in patients with severe gastrointestinal bleeding is emergency endoscopy. The lesion is rare but potentially life threatening source of upper gastrointestinal bleeding. Before the endoscopic era, the prognosis for patients with these lesions was quite poor. However, recent reports have described the success of endoscopic therapy in the management of Dieulafoy lesion. We performed emergency endoscopy in 3 patients who had massive or recurrent episode of upper gastrointestinal bleeding, identified to the Dieulafoy lesion. We tried to Endoscopic $quot;0$quot; band ligation, successfully in hemostasis and prevention of recurrence.
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