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반응매체로써 용융염을 사용한 연소가스로부터 NO의 제거에 관한 연구(Ⅱ)
배성렬,김희택 漢陽大學校 環境科學硏究所 1989 環境科學論文集 Vol.10 No.-
기포탑내에서 용융염(50mol% NH₄HSO₄, 50mol% NaHSO₄)과 V₂??계 촉매를 사용하여 온도범위 150∼180℃ O₂존재하에서 NH₃에 의한 NO의 환원반응에 대하여 조사하였다. NO의 환원속도는 NO의 농도에 대하여 1차 나타내었고 V₂??와 V₂??-NH₄Br-TiO₂-SiO₂촉매계에서1차 속도상수를 결정하였다. 또한 같은 온도범위내에서 용융염중의 NO에 대한 Henry 상수를 결정하였다. The kinetics of the reduction of NO by NH₃in the presence of O₂ in molten salts of 50mol% NH₄HSO₄and 50mol% NaHSO₄with V₂O as catalyst were investigated by chemical absorption method using a bubble column reactor at temperatures ranging from 150 to 180℃. The rate of the reduction of NO could be expressed as first-order with respect to the concentration of NO. The first-order reaction rate constants with V₂?? and V₂??-NH₄Br-TiO₂-SiO₂as catalyst were determined. The Henry's law constants of NO in the molten salts were determined in the same range of temperature.
케토프로펜-폴리에틸렌글리콜 전구약물의 합성 및 가수분해
이세희,김희두,오승열 한국약제학회 2003 Journal of Pharmaceutical Investigation Vol.33 No.1
The objective of this study is to prepare ketoprofen (KP) - poly(ethylene glycol) (PEG) conjugates and to investigate their degradation kinetics. KP-PEG conjugates were synthesized from KP and PEG methylester by esterification in the presence of DCC. The KP-PEG conjugates (KPEG) were characterized by IR and ^1H-NMR spectroscopy. The hydrolysis of KPEG with time was studied using HPLC by simultaneous quantification of KP and KPEG. The hydrolysis rate constant was high at low and high pHs, and showed minimum at pH 4 and 5. As the size of KPEG increase, hydrolysis rate increased. The slope of degradation rate profile suggests that catalytic reaction seems to occur by specific acid/base catalysis. These results suggest that KPEG could be used as a prodrug for KP, which releases KP slowly in the body.
미세혈관문합시 헤파린의 국소 및 전신 투여가 혈전 형성에 미치는 영향
김성열,오희균 전남대학교 치의학연구소 2003 구강과학 Vol.15 No.2
The need of microvascular anastomosis or vascular graft has been increased gradually to reconstruct the maxillofacial defects. Despite advances in microsurgical technique, instrumentation and experience gained in clinical microvascular surgery, thrombosis of small veins may lead to the failure of microvascular surgery. A variety of anticoagulant agents have been used in either experimental or clinical microvascular surgery in order to decrease the failure rate of microvascular anastomosis and to prevent the need of reoperation. Heparin, which has been known to be effective in preventing thrombosis and in improving patency after microvascular anastomosis, is used locally or systematically. However, their effects is controversial. This study was performed to evaluate the effect of topical and intravenous heparin on thrombosis and patency in the microvascular anastomosis of the traumatized veins. Nine white rabbits wishing about 2 kg were used. After exposure of both femoral veins, the veins were crushed by the jaws of smooth needle holder in order to create a thrombosis model. Transectional incision was made in the vein. The animals were then divided into 3 groups based on the administration method of heparin: 1) Experimental Group 1, topical irrigation of lumen with heparin saline solution (n=6); 2) Experimental Group 2, topical irrigation of lumen with heparin saline solution and intravenous injection of heparin (0.75 mg/kg) via the marginal ear vein for 3 days; 3) Control Group. topical irrigation of lumen with saline solution (n=6). The veins were anastomosed utilizing microvascular technique with 10-0 Ethilon. The vascular patency was evaluated with empty-and-refill test 30 minutes and 3 days after microvascular anastomosis. The amount of thrombus was evaulated by surgery microscope 3 days after microvascular anastomosis and histologic findings were observed. The results are as follows: 1. Thirty minutes after microvascular anastomosis, the patency of all Experimental Groups was better than Control group. However, there was no significant difference among groups. 2. Three days after anastomosis, the patency of all Experimental Groups was much more improved than that of Control Group (p<0.05). There was no significant difference between Experimental Group 1 and 2. 3. Three days after anastomosis, the amount of thrombus in all Experimental Groups was much less than that of Control Group (p<0.05). 4. In histologic findings a lot of luminal thrombus were observed around sutured area in Control Groups. Few luminal thrombus was observed in all Experimental Groups. Mild necrosis in the vessel wall was observed around sutured area in all specimens. These results indicate that topical irrigation of heparin may improve the patency and inhibit the formation thrombus in the microvascular anastomosis of the traumatized veins.
외과적 보조의 급속상악확장술 : 치험 5예 REPORT OF 5 CASES
박충열,이용욱,송종운,김영운,박홍주,오희균,유선열,이기현,황현식 대한악안면성형재건외과학회 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.1
Five adults (3 cases of bilateral posterior crossbite, 2 cases of unilateral posterior crossbite) with intermaxillary discrepancy of over 5㎜ due to maxillary transverse deficiency were treated by surgically assisted rapid maxillary expansion (SARME). Bilateral maxillary horizontal osteotomies, osteotomies of pterygomaxillary junction and anterior lateral nasal wall, ans anterior palatal osteotomy were performed in 4 cases, and unilateral osteotomies in 1case, followed by palatal expansion with tooth-borne orthopedic applicance. No significant complication was observed. The mean palatal expansion was 7.2㎜ (5.8∼10.0㎜) in the maxillary first molar region. During the mean follow-up period of 4 years (5 months∼8 years 7 months), no recurrence of crossbite was observed in all cases. The SARME seemed to be a simple, stable, and reliable procedure for achieving a permanent increase of over 5㎜ in skeletal maxillary transverse width of adults.
채희창,강희용,유상훈,이승현,문홍렬 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.2
Nowadays, as the development period of new products becomes shorter and consumer's requirement is more various, the importance of Rapid Prototyping Technology has been rapidly increased. Rapid Prototyping makes prototypes or functional parts directly using the 3D CAD data. But RP machines can make protypes in limit size. For making large size prototype, we slice solid, which is made of STL file, and then glue sliced solid. And if contact area of part is small, union solid will be easily destroyed for going down of adhesion. So we need to expand contact area, I suggest making a section into stair shape. This paper is concerned with slicing solid on STL file and improving on adhesion.
발치후 임프란트 매식 시기에 따른 골유착에 관한 연구 : Histomorphometric and Biomechanical Studies 조직형태계측학적 및 생역학적 연구
오희균,류선열 大韓顎顔面成形再建外科學會 1994 Maxillofacial Plastic Reconstructive Surgery Vol.16 No.4
The purpose of this study was to investigate the effect of timing of implant insertion on osseointegration after tooth extraction. Fifteen mongrel dogs, weighing 15kg or more, were used. The lower right 1st, 2nd, 3rd, 4th premolars and 1st molar were extracted under general anesthesia. Implants were inserted at 2, 4, and 8 weeks after extraction of the teeth, being designated as 2-, 4-, and 8-week groups, respectively. Results obtained were as follows. 1. Macroscopically there was neither an infection at the implant site nor an exposure of the implant. 2. Histologically the surrounding bone of the implant was less mature in the 2-week group than in the 4- and 8-week groups. 3. The implant-bone contact ranged from 75 to 82%, with no significant differences among the groups. No increase in the implant-bone contact was found with increasing healing periods from 4 to 12 weeks after implant insertions. 4. The average depth (0.64mm) of the fibrous connective tissue ingrowth in the 2-week group was slightly deeper than those in the 4- (0.51mm) and 8-week (0.53mm) groups at 12 weeks after implant insertion. 5. the implant-bone interfacial bond strengths were 73.05kgf in the 2-week group, 69.71 kgf in the 4-week group and 73.76 kgf in the 8-week group. No significant difference was noted in pullout force among the groups. The degree of confidence of interfacial bone strength was highest in the 8-week group, followed by the 4- and 2-week groups. These results indicate that at least 4 weeks of healing period will be required before implant is to be inserted following tooth extraction.
구내신연장치를 이용한 치조골증대술 후 임프란트 매식 : 치험 5예 REPORT OF 5 CASES
이용욱,박충열,송종운,박홍주,김영운,오희균,유선열 대한악안면성형재건외과학회 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.2
Successful alveolar ridge augmentation by distraction osteogenesis method has been reported previously. There are several types of devices for alveolar ridge augmentation. In this paper, a new intraoral distraction device was used on the severe atrophic mandible in order to distract an alveolar ridge vertically in 5 patients. Mean amount of distracted alveolar ridge was 7.4㎜ (5∼9.5㎜). Dental implants were placed in the distracted alveolar bone and good osseointegration was obtained in all patients. Mean follow up period is 2years 6months (7months∼4years 9months). No complications, such as infection or resorption was observed in all patients. Alveolar ridge augmentation by gradual distraction seems to be a safe, simple and reliable procedure.
곰팡이 독소인 Fumonisin B₁의 Polyclonal Antibody 제조
김동수,이은열,김희숙 경성대학교 2001 論文集 Vol.22 No.1
Specific antibodies were produced to develope the enzyme-linked immunosorbent assay for analysis of fumonisin Bl, a toxin which Fusaium sp. produced in com, soghum, and rice. Fumionisin Bl-keyhole impact hemocyanin conjugate were immunized to produce polyclonal antibodies. By using indirect competitive ELISA, the reactivity of the antibodies against fumonisin Bl were investigated and the problems on developing the ELISA were detected. And, contamination level of fumonisin Bl in imported corns and animal feeds was also investigated.
李基完,朴喜烈 東新大學校 1997 論文集 Vol.9 No.-
Recently, the importance of groundwater is higher as the use of groundwater for drinking, agriculture and industry sisnificantly increases. However, groundwater has been contaminated by industrial waste, domestic sewage, landfill leachate and seawater intrusion. Therefore, it is necessary to understand the chemical characteristics and water-rock interaction of groundwater for the preservation of groundwater resources. The purpose of this study is to find out the magnitude of groundwater contamination, and its water-rock interaction characteristics in granitic regions. The Cretaceous Palgongsan granitic regions are selected as the study area. The results are as follows : Groundwater is contamimated by NO_3^- in a Part (CP-3, CP-4, CP-5) of study region. K^+/Na^+ in groundwater of study legion is equivalent to 1/10 for K_2O/Na_2O of rock. Groundwater's evolution is being progressed to noncarbonate hardness tupe of Ca^2+ -HCO_3^-, continuously noncabonate alkali type of Ca^2+, Cl^-, SO_4^2-. Saturation index of aluminosilicate minerals for groundwater is dominated kaolinite. This indicates the initial evolution process of groundwater.