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시멘트의 수화응결에 대한 Sodium Naphthalene Sulfonate Formaldehyde 축합물의 영향에 관한 연구
노재성,김종웅 충남대학교 공업교육연구소 1987 論文集 Vol.10 No.1
This paper has been studied on the effect of Sodium Naphthalene Sulfonate Formaldehyde condensate(SNSF) to Cement, C₃A, C₃S and C₄AF by Zeta potential. The major results are as follows; (1) The Zeta potential of cement and C₃S are increased according to SNSF concentration, at this time, the initial hydration rate of these are retarded. On the other hand, the zeta potential of C₃A and C₄AF are decreased and initial hydration rate are accelerated. (2) Adsorption quantity of SNSF on the surface of cement and C₃S particles are increased with hydration time. But in the case of C₃A, adsorption quantity is decreased. (3) The initial hydration rate of cement is accelerated according to increasing of Na₂SO₄quantity in SNSF. But the side of this the initial hydration rate of cement is retarded.
초음파 시험법에 의한 실존 콘크리트 구조체의 압축강도 추정식에 관한 연구
권영웅,유재은,신정식 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
This study concerns the new strength equation of concrete by ultrasonic pulse velocity test. There are not only few estimate strength equations of concrete by nondestructive test, but also many problems to apply them because of time, cost, easiness, structural damage, reliability and so on. For this study, there performed a series of test and proposed a equation as follows ; Linear : fck = 70.57Vp - 222.9, r²=91.3% Quadratic : fck = 19.868Vp² - 76.6Vp + 48.1, r²=91.7% here, fc estimated compressive strength of concrete by MPa Vp : Ultrasonic Pulse Velocity of concrete by km/sec.
주재동,이의웅,김준배,박광호,김형곤 大韓顎顔面成形再建外科學會 1994 Maxillofacial Plastic Reconstructive Surgery Vol.16 No.4
Authors have studied retrospectively the facial nerve injury after TMJ surgery through the preauricular approach routine. The study material used was 4 patients of all 113 patients who were diagnosed as internal derangement and have been operated from March 1989 to February 1991 in Youngdong severance hospital, and were induced postoperatived facial nerve injury. The patient group who had the postoperative injured facial nerve was recognized degree of injury using the diagnostic method, Electromyography(EMG) and Nerve conduction test(NCT) which are used widely at present and was treated as conservative care and we identified the recovery time as the same method. The results as follows : 1. The meticulous care and precious surgical technique are needed in both operation and postoperation. During the TMJ surgery, the excessive retraction of the flap and frequent use of nerve stimulator and electric surgical knife should be avoided as possible and postoperative hematoma and swelling should be minimized. 2. The 4 patients were experienced with the postoperative facial nerve injury of all 133 patients who had been operated the TMJ surgery through the routine preauricular approach on our hospital. And the incidence of postoperative facial nerve injury happened was about 0.3% and its incidence was relatively low comparing with any other previous reports. 3. EMG and NCT were considered as useful methods which can diagnose the nerve injury objectively and identified the effect of treatment and recovery time. 4. The faical nerve-injured patients who were induced postoperatively after TMJ surgery, were diagnosed as second-degree nere injury through the EMG and NCT. And the patient group was treated well as conservative physical therapy for about 2 to 4 months.
YBa₂(Cu_(1-x)Fe_(x))₃O_(9-y)계의 초전도성과 Mossbauer 효과
申榮男,金在慶,조현웅 大邱大學校附設 基礎科學硏究所 1990 基礎科學硏究 Vol.7 No.-
YBa₂(Cu_(1-x)Fe_(x))₃O_(9-y) superconductors are prepared and their physical characteristics are investigated by measuring the resistivity, X-ray diffraction pattens and Mossbauer spectra. At x=0.03, the crystal structure is transformed from orthorhombic to tetragonal system. Transition temperatures are not changed in the orthorhombic region, but linealy decreased with increasing x in the tetragonal region (80K at x=0.03 and 30K at x=0.1). The Mossbauer spectra are fitted to Lorentzian line shapes with two quadrupole doublets. Two main doublets and lattice parameters indicate that the valancy of Fe is +3. F2 site has typical square-pyramid coordination and F1 site has highly atypical (for Fe^(3+)) coorination of square-planar.
The Effect of Bevacizumab on Corneal Neovascularization in Rabbits
Wung-Jae Kim,Hee-Ok Jeong,Sung-Kun Chung 대한안과학회 2010 Korean Journal of Ophthalmology Vol.24 No.4
Purpose: To determine the efficacy of topical application and subconjunctival injection of bevacizumab in the treatment of corneal neovascularization. Methods: Corneal neovascularization was induced with a silk suture of the corneal stroma in 12 rabbits (24 eyes). One week after suturing, four rabbits were treated with topical bevacizumab at 5 mg/mL (group A) and another four rabbits were treated with topical bevacizumab 10 mg/mL (group B) in the right eyes twice a day for two weeks. A subconjunctival injection of bevacizumab 1.25 mg/mL was done in the right eyes of four rabbits (group C). All of the left eyes (12 eyes) were used as controls. The area of corneal neovascularization was measured after one and two weeks, and the concentration of vascular endothelial growth factor (VEGF) in corneal tissue was measured after two weeks. Results: The neovascularized area was smaller in all treated groups than in the control group (p<0.001). Upon analysis of the neovascularized area, there was no significant difference between groups A and B. However, the mean neovascularized area of group B was significantly smaller than that of group C after two weeks of treatment (p=0.043). The histologic examination revealed fewer new corneal vessels in all treated groups than the control group. The concentration of VEGF was significantly lower in all treated groups compared to the control group (p<0.01), but no difference was shown between treated groups. Conclusions: Topical and subconjunctival bevacizumab application may be useful in the treatment of corneal neovascularization and further study is necessary.
Jae Wung Lee,Ik Je Kim,In Mo Ryu,Seong Gyu Park,Gwan Soon Choi,Yong Woong Kwon 韓國作物學會 1999 Korean journal of crop science Vol.44 No.4
Swordbean was recently introduced to Korea, and cultural technique for stable production, e.g. optimum seeding date and planting space, has not been established. This experiment was conducted to elucidate the changes of growth characteristics, yield components, and yield as affected by different seeding dates and planting spaces. Days to flowering was shortened by 4∼28 days as seeding was delayed. Stem diameter, number of pods per plant, number of seeds per plant, 100-seed weight, and seed yield tended to increase with delaying seeding up to 5 April and then to decrease with further delaying seeding. These results indicate that optimum seeding date of swordbean in unheated polyvinyl house would be early April. Although, the swordbean exhibited large increases in plant height, number of branches per plant, and stem diameter at the wider spacings, planting space could be decreased to the 60 cm plant-spacing and 30 cm row-spacing with no deleterious effect on yield.
Original Article : The Effect of Bevacizumab on Corneal Neovascularization in Rabbits
( Wung Jae Kim ),( Hee Ok Jeong ),( Sung Kun Chung ) 대한안과학회 2010 Korean Journal of Ophthalmology Vol.24 No.4
Purpose: To determine the efficacy of topical application and subconjunctival injection of bevacizumab in the treatment of corneal neovascularization. Methods: Corneal neovascularization was induced with a silk suture of the corneal stroma in 12 rabbits (24 eyes). One week after suturing, four rabbits were treated with topical bevacizumab at 5 mg/mL (group A) and another four rabbits were treated with topical bevacizumab 10 mg/mL (group B) in the right eyes twice a day for two weeks. A subconjunctival injection of bevacizumab 1.25 mg/mL was done in the right eyes of four rabbits (group C). All of the left eyes (12 eyes) were used as controls. The area of corneal neovascularization was measured after one and two weeks, and the concentration of vascular endothelial growth factor (VEGF) in corneal tissue was measured after two weeks. Results: The neovascularized area was smaller in all treated groups than in the control group (p<0.001). Upon analysis of the neovascularized area, there was no significant difference between groups A and B. However, the mean neovascularized area of group B was significantly smaller than that of group C after two weeks of treatment (p=0.043). The histologic examination revealed fewer new corneal vessels in all treated groups than the control group. The concentration of VEGF was significantly lower in all treated groups compared to the control group (p<0.01), but no difference was shown between treated groups. Conclusions: Topical and subconjunctival bevacizumab application may be useful in the treatment of corneal neovascularization and further study is necessary.