플라즈마 이온주입기에서의 시변환 쉬스 연구

김곤호,김건우,김영우,최영도,김종식,김상진,한승희,홍문표 漢陽大學校 工學技術硏究所 1998 工學技術論文集 Vol.7 No.1

Abstract- In a plasma source ion implantation, the target is successively biased by negative voltage pulses with an intrinsic finite rise time, resulting in the time-dependent sheath formation around the target. Measurement of time-dependent sheath during the pulse rise show the ion matrix sheath development which is in proportion to square root of time and pulse rise rate over plasma density but independent of the ion mass.

寒熱의 發生과 病證에 對한 理論的 硏究

柳道坤,鄭遇悅 圓光大學校 韓醫學硏究所 1991 원광한의학 Vol.1 No.1

It is well known that Oriental medicine has a characteristic system of theory and superior remedial value. The purpose of this study is to elucidate the vague Oriental medical concepts for its objectification and clinical application. Han and Yeal were recognized as a part of climate changes in the first stage of Oriental medicine, Gradually, they have been applied to the medial concepts such as the metabolic principle and nature of diseases. Han, yin is recognized as the decline of physiological function, reduction of defense and induces metabolic abnormal depression. Yeal, yang is recognized as the acceleration of body function, inflammatory disease and induces metabolic abnormal stimulation.

제올라이트 촉매에서 m-디이소프로필벤젠의 분해반응

김도일,정경환,김종호,서곤 전남대학교 촉매연구소 2001 觸媒硏究 論文集 Vol.22 No.-

Dealkylation of m-diisopropylbenzene (m-DIPB) was studied on various zeolite catalysts which have different pore structures. The very low dealkylation activity was observed on MFI zeolite because of its small pore size. The m-DIPB low conversions of MOR and FAU zeolites were due to severe deactivation of the catalysts by carbon deposites. On the other hand, the high conversion and the low deactivation in the m-DIPB dealkylation were observed on BEA zeolite with bent pores and MWW zeolite with pillow-type pores. In particular, the MWW zeolite shows a very high conversion, because the polymerization of m-DIPB resulting to carbon deposites is suppressed by sharing one m-DIPB molecule per unit pore. The high selectivity for benzene on MWW zeolite is explained by long retention time of reaction intermediate inducing consecutive dealkylation.

남자 알코올 의존 환자의 기질적 특성에 관한 연구

김성곤,민영기,이덕기,김미영,송영상,권도훈,고영훈,박제민,정병선 대한생물치료정신의학회 2003 생물치료정신의학 Vol.9 No.1

목 적: 본 연구의 목적은 한국인 남자 알코올 의존 환자의 기질적 특성을 Temperament and Character Inventory(TCI)를 이용하여 조사하는 것이다. 방 법: DSM-Ⅳ 진단 기준에 맞는 알코올 의존 환자 30명과 정상인 36명을 대상으로 연구학적 특성을 조사하고, 기질적 특성을 한글판 TCI를 이용하여 조사하였다. 모든 대상자의 나이는 30~60세였다. 결 과: 1) 두 군간 평균 나이는 유의한 차이가 없었으나, 교육 정도와 결혼을 유지하고 있는 비율 및 취업률은 알코올 의존군이 정상 대조군에 비해 유의하게 낮았다. 2) 알코올 의존군에서는 정상 대조군에 비해 Harm Avoidance(HA) 점수와 Self-transcendence(ST)점수는 유의하게 높았으며, Self-directiveness(SD)점수는 유의하게 낮았다. 3) 알코올 의존군 내에서의 각 척도들 간의 상관관계는, HA와 SD 점수, HA와 Persistence(PE) 점수, ST와 SD 점수는 각각 유의한 음의 상관관계, ST와 PE 점수, SD 점수와 Cooperativeness(CO) 점수, Reward Dependence(RD)와 CO 점수는 양의 상관관계를 보였다. 결 론: 이러한 본 연구의 결과는 한국인 남성에서 수줍음을 잘 타며, 걱정도 많고, 염세적이고 쉽게 피로해지는 기질적 특성이 알코올 의존과 연관성이 있음을 의미한다. Objectives : The purpose of this study was to assess the temperament of male parients with alcohol dependence. Methods : The subjects were 30 patients who met DSM-Ⅳ criteria for alcohol dependence and 36 normal controls. All subjects completed Temperament and Character Inventory(TCI) which was developed by Cloninger. Results : 1) The educational level, marital status, and occupation in alcohol dependence group were significantly lower than those of normal control group, but there was no difference in the age between two groups. 2) Among the scores of TCI, the score of harm avoidance(HA) and self-transcendence(ST) were significantly higher in the alcohol dependence group than in the normal control group. 3) In the alcohol dependence group, a significant negative correlation among the scores of TCI was between HA and SD, HA and Persistence(PE), ST and SD, and positive correlation between ST and PE, SD and Cooperativeness(CO), Reward Dependence(RD) and CO. Conclusion : These results suggest that shy, fearful, pessimistic and fatigable temperament are related to developing alcohol dependence in Korean males.

안테나 형태에 따른 대면적 ICP 플라즈마의 균일도 면화에 관한 연구

최영도,노태협,김곤호 한양대학교 이학기술연구소 2001 이학기술연구지 Vol.3 No.-

대면적 균일 ICP 플라즈마를 발생시킬 수 있는 IPC용 안테나 개발을 위하여 안테나 구조와 안테나에 흐르는 전류 방향에 따른 발생 플라즈마의 특성을 Langmuir 탐침과 자기 탐침을 이용하여 관찰하였다. 안테나의 구조가 내부 안테나와 외부 안테나로 이루어진 두 안테나에 흐르는 전류방향이 반대 방향일 때는 같은 방향일 때보다 플라즈마 밀도 균일도가 향상되는 경향을 가졌다. 직경 300mm에서의 플라즈마 균일도가 2~3%를 나타내었다. 이 결과를 이용하여 Super Flat Antenna(SFA)를 개발하였다. This paper presents effects of antenna shape and current direction on plasma density uniformity for a large area uniform ICP plasma parameters. The antennae were composed of a rectangular inner and outer antenna. When the current direction along the antenna was opposite, plasma uniformity was improved in compare with the same current direction along the antenna. The optimized antenna can generate the uniform plasma within 2-3% uniformity in 300mm diameter and is called Super Flat Antenna (SFA).

Effect of repair methods and materials on the flexural strength of 3D-printed denture base resin

Hamile Emanuella do Carmo Viotto,Marcela Dantas Dias Silva,Thaís Soares Bezerra Santos Nunes,Sabrina Romão Gonçalves Coelho,Ana Carolina Pero 대한치과보철학회 2022 The Journal of Advanced Prosthodontics Vol.14 No.5

PURPOSE. The aim of this study was to evaluate the flexural strength of a 3D-printed denture base resin (Cosmos Denture), after different immediate repair techniques with surface treatments and thermocycling. MATERIALS AND METHODS. Rectangular 3D-printed denture base resin (Cosmos Denture) specimens (N = 130) were thermocycled (5,000 cycles, 5°C and 55°C) before and after the different repair techniques (n = 10 per group) using an autopolymerized acrylic resin (Jet, J) or a hard relining resin (Soft Confort, SC), and different surface treatments: Jet resin monomer for 180 s (MMA), blasting with aluminum oxide (JAT) or erbium: yttrium-aluminum-garnet laser (L). The control group were intact specimens. A three-point flexural strength test was performed, and data (MPa) were analyzed by ANOVA and Games-Howell post hoc test (α = 0.05). Each failure was observed and classified through stereomicroscope images and the surface treatments were viewed by scanning electron microscope (SEM). RESULTS. Control group showed the highest mean of flexural strength, statistically different from the other groups (P < .001), followed by MMA+J group. The groups with L treatment were statistically similar to the MMA groups (P > .05). The JAT+J group was better than the SC and JAT+SC groups (P < .05), but similar to the other groups (P > .05). Adhesive failures were most observed in JAT groups, especially when repaired with SC. The SEM images showed surface changes for all treatments, except JAT alone. CONCLUSION. Denture bases fabricated with 3D-printed resin should be preferably repaired with MMA+J. SC and JAT+SC showed the worst results. Blasting impaired the adhesion of the SC resin.

梔子大黃湯과 茵蔯梔子湯 Extract가 白鼠의 肝損傷에 미치는 影響

車宗泰,柳道坤,康舜洙 圓光大學校 韓醫學硏究所 1987 圓光醫科學 Vol.3 No.1

An attempt was made to evaluate the effects of Chijadaewhangtang extract (CDE) and Inchinchijatang extract (ICE) on the recovery of hepatotoxicity induced acute treatment of carbon tetrachloride and results were as follows: 1. When rats of carbon tetrachloride-intoxication were treated with CDE and ICE, the serum aspartate aminotransferase activities released from liver were decreased. In ICE treated group, there were significant decrement after 12 hours and more fast return to normal values in comparison with CDE treated group. 2. In CDE and ICE-treated group, as compared with only carbon tetrachloride-treated group there were inhibition of serum alanine aminotransferase elevation and significant decrement was observed in ICE treated group after 48 hours and CDE treated group after 72 hours. 3. Serum alkaline phosphatase values were significantly diminished in CDE and ICE-treated group compared with only carbon tetrachloride intoxicated group. Meaningful diminution was observed in ICE administered group after 48 hours and CDE administered group after 96 hours. 4. Significant decrement of serum lactate dehydrogenase elevation after 96 hours was observed in CDE and ICE-treated group and more fast recover to normal values. 5. Administration of CDE and ICE shortened prothrombin time of plasma and significant recovery was showed in ICE treated group after 72 hours and CDE treated group after 96 hours. From these results, the recuperative effects of CDE and ICE on carbon tetrachloride-induced hepatotoxicity could be verified experimentally.

초속경 라텍스개질 콘크리트의 초기수축 및 구속건조수축

최판길,김용곤,심도식,이봉학 江原大學校 産業技術硏究所 2005 産業技術硏究 Vol.25 No.A

Recently, very-early strength latex-modified concrete(below ; VES-LMC) has been developed for repairing and overlaying the old concrete bridge deck. VES-LMC provides the advantage of very-early-strength, as well as high flexural strength, bond strength, durability, resistance to corrosion, reduced water permeability and resistance to damage from freeze-thaw cycles. The compressive and flexural strength of VES-LMC are 21 MPa and 4.5 MPa at 3 hours after concrete placing, respectively. However, VES-LMC would have a relatively large shrinkage at early-age because of reduced water-cement ratio, big water self-dissipation, and rapid hydration reaction. Therefore, the purpose of this study was to evaluate the early-age and restrained shrinkage of VES-LMC, having an experimental variables such as latex contents and cement types. The latex contents included 0%, 5%, 10%, 15% and 20%, and the cement types included ordinary portland cement and very-early strength cement.

香砂平胃散 및 加減方이 白鼠의 摘出腸管運動에 미치는 影響

宋孝元,柳道坤,韓宗鉉,康舜洙 圓光大學校 韓醫學硏究所 1992 원광한의학 Vol.2 No.1

Subtracting from component drugs by nine cases in Hyangsapyengwisan(香砂平胃散), its prescription and investigated the effect on contractile force of intestine in rats. The results obtained were as follows : 1. The effect of relaxation after contraction of rat ileum could be observed by administration of Hyangsapyengwisan. 2. By pretreatment with Atropine, the contractility of Hyangsapyengwisan was suppressed. 3. No change observed in contractile response of Hyangsapyengwisan by pretreatment with Cyproheptadine. 4. By pretreatment with Propranolol, the relaxation of Hyangsapyengwisan was suppressed. 5. The effect of relaxation after contraction of Hyangsapyengwisan was similar to that of Atractylodis Rhizoma. 6. The contractile response observed in subtracted Cyperi Rhizoma and Magnoliae Cortex from Hyangsapyengwisan, while growps in subtracted Atractylodis Rhizoma, Aurantii Nobilis Pericarpium Cyperi Rhizoma, Ponciri Fructus, Agatsachis Herba, Cyperi Rhizoma and Ponciri Fructus, Ponciri Fructus and Magnoliac Cortex from Hyangsapyengwisan showed the relaxation. These results suggest that Hyangsapyengwisan has a contractile effect which may be caused by the partial action of sympathetic and parasympathetic nervous system.

淸肺散 煎湯液이 家兎의 腎臟機能에 미치는 影響

張根國,李昊燮,柳道坤 圓光大學校 韓醫學硏究所 1992 원광한의학 Vol.2 No.1

To evalute effect of Chungpyesan(淸肺散) Water Extract on the renal function, blood pressure and heart rate, experiment performed in rabbits. The results obtained were as follows : 1. Intravenous administration of Chungpyesan Water extract at the doses of 0.75㎖/㎏ significantly increased renal plasma flow, glomerular filtration rate, urinary excretion of electrolytes and urinary excretion of free water clearance, in particular, urine volume. 2. Urine volume, glomerular filtration rate and urinary excretion of electrolytes were increased remarkably after intravenous administration of Chungpyesan Water extract at the doses of 1.5㎖/㎏. 3. Intravenous administration of Chungpyesan Water extract at the doses of 0.75㎖/㎏ significantly increased heart rate. 4. Intravenous administration of Chungpyesan Water extract at the doses of 1.5㎖/㎏ significantly decreased blood pressure, whereas heart rate remakably increased. These results suggest that Chungpyesan Water extract has a diuretic effects, which may be caused by urinary excretion of electrolytes, renal hemodynamics.