눈의 苛性「소다」傷의 治療에 關한 實驗的硏究

梁在雄 中央醫學社 1963 中央醫學 Vol.5 No.2

There have been no definitely reliable means of treating alkali burns of the eye in the past. Herewith, the present investigation was undertaken to establish the most ideal and app: op date therapeutic regimens for alkali burns of the eye experimentally induced in the rabbits. The rabbits were anesthetized with pentobarbital sodium (30mg/kg; I. V.) and 2 ml. of 1/10 N. NaOH solution was applied locally to the eye for 5 minutes. The eye was then irrigated with, unless stated otherwise, normal saline for 5 minutes. Immediately following the production of the burn, the following therapeutic measures were applied for a period of up to 8 weeks:. A. Non-s argicaI treatment: 48 animals were subdivided into the following 4 groups:, a) Control group: No therapeutic measure was applied. b) Cortisone group: One or two drops of 0.5% cortisone acetate suspension was instilled every 2 hrs during the daytime and 1.5% cortisone acetate ointment was locally applied at night. . c) Acetic acid group: 1% acetic acid was used to irrigate the eye for 15 minutes. In this group, the washout with normal saline was omitted. d) Ammonium tartrate group: One or two drops , of 10% neutral ammonium tart-rate solution was instilled 4 times a day. B. Surgical treatment: 54 animals were subdivided into the following 3 groups. a) Control group: No treatment was gbien. b) Homograft group: The homograft was performed on the palpebral conjunctiva and on the bulbar conjunctiva alone or with the upper part of the cornea. Having performed the homograft operation 1% atropine sulfate ointment and 0.5% oxytetracycline ophthalmic ointment were applied locally twice a day. c) Heterograft group: Human amniotic membrane was used for this group and the transplantation was performed on the bulbar conjunctiva. The amniotic membrane was stored in a refrigerator (4°C) for 16―24 hrs prior to the operation. The postoperative care as described for the previous group was also given. Following these treatments, the , eye was enucleated at scheduled time intervals and were fixed in 10% formaline solution before the histological sections were made. These sections were stained with hematoxyline and eosin. The degree of healing was judged by stological examination. A) Non- surgical group: Severe inflammatory reaction and marked postinflaminatory result such as pseudopterygium and symblepharon was formed in the control group. Cortisone was most effective in minimizing the inflammatory reaction and also in resulting sequelae such as neovascularization into cornea and symblepharon. Newly formed vessels in cornea was faint, short in length and much less in number than other groups. The onset of vascularization in cornea was slightly delayed. Fibrous scar formation of subconjunctival tissue and symblepharon was less significant than other groups. Corneal reepithelization was not delayed or interfered by local treatment with cortisone. Neutralization with 1% acetic acid solution was not effective but rather harmfulthan control group. Neutral ammonium tartrate solution did not help the clearance of corneal opacity and consequently brought similar results with control group. B) Surgical group: Regardless of the site of transplantation, the homograft with the conjunctival mucous membrane after removal of the traumatized necrotic tissue worked excellently for minimizing reaction and reducing the resulting sequelae. Symblepharon was little or none. Pseudopterygium was not seen in these groups, although it was common in the nonsurgically treated groups. The homograft on the palpebral conjunctiva or on the bulbar conjunctiva and the upper part of cornea caused a marked fibrous scaring and extensive neovascularization of the cornea. Transplantation to a portion of the bulbar conjunctiva was most effective in minimizing the inflammatory reaction, fibrous scar formation, and neovascularizion of the cornea. The amniotic membrane had a marked tendency to shrink after the transplantation. This is a serious handicap as compared with the homograft using the conjunctiva. However, this membrane took well after the transplantation . and the host conjunctival epithelium grew over this membrane. This minimized the reaction and resulting. sequelae. Amniotic membrane can be used as a substitute for the homograft with relatively, good results. judging from these results, in the non-surgical group, the ideal treatment for the alkali burn with NaOH is the immediate, thorough washing with water or saline solution and applicationof cortisone. Results of surgically treated group were much. better than non-surgically treated group, but these groups did not work satisfactorily in clearing the corneal opacity. It is probably due to a severe primary damage of the corneal tissue by alkali.

AOD 스테인레스 제강공정에서 CaO-Cr₂O₃ 슬래그 중 용존 Si에 의한 Cr₂O₃의 반응속도론

양재웅 대진대학교 2002 大眞論叢 Vol.10 No.-

The reduction rate of solid slag, CaO-Cr₂O₃ which is the reaction product formed at the oxidation period of A.O.D process was measured in the presence of residual Si at temperatures between 1600 and 1700℃. Synthetic solid slags of CaO-Cr₂O₃binary and also of ternary containing MgO or CaF₂ as additives were respectively prepared by compacting and sintering in a form of disk. Reduction experiments were carried out by adding Si into liquid metal pool and then placing the disk on it in a high frequency induction furnace. From results observed a reaction mechanism was proposed ; the reduction rate is controlled by a mixed process combining diffusion-out of Cr₂O₃ through liquid slag layer of CaO-Cr₂O-SiO₂ and the surface reaction on the liquid slag/liquid metal interface. Experimental activation energies, therefrom, were determined to be 63kcal/mole for the diffusion process and 152kcal/mole for the surface reaction. Effects of slag additives, such as MgO and CaF₂ on reduction of Cr₂O₃ were also discussed and favourable working conditions at the reduction period of the A.O.D process were suggested.

쾌삭 STD61 강에서 개재물의 성분 및 형태에 미치는 첨가원소의 영향

양재웅 대진대학교 첨단소재연구소 1999 첨단소재연구소논문집 Vol.2 No.-

The free cutting SDT61 steel is known as the materials of the standard hot work die with a good machinability which makes cutting after quenching possible, thereby, improving the machining accuracy and the effective productivity, compared with the conventional method of heat treatment after cutting. With SKD61 steel as the base metal, in varying additions of free cutting element S, non-metallic inclusion shape control elements Zr, Ca were added and melted in air and were casted, forged and heat treated finally to make specimens. The inclusion distribution was tested by etching pattern and image analyzer and composition and morphology of inclusions were examined with the optical and electron microscope. Therefore, the optimum size, distribution and phase of non-metallic inclusions were chosen to investigate the effects of addition elements on composition and morphology of inclusions in free machining STD61 steel and elucidate the mechanism of its formation. The results of this research were as followers. First, inclusion shape control elements Ca and effective Zr contributed in spheroidizing MnS, and Ca was especially effective in the fine distribution of inclusions. Sencond, in these steel types, the addition of Zr facilitated Zr nitride formation through nitride stabilizing elements such as Cr, Mo, V and Zr. The effective Zr exited as (Mn, Zr)S, thereby contributing in spherodizing MnS. Third, with increasing the additions of free cutting element S, the cleanness of steel was lowered due to the increase of MnS inclusions.

레스토랑 이용자의 착석 행태에 관한 연구

양재웅 중앙대학교 대학원 건축미술학과 1992 建美論叢 Vol.2 No.-

밀봉유리-금속 계면의 산화층이 내전압 특성에 미치는 영향

양재웅 대진대학교 1998 大眞論叢 Vol.6 No.-

Glass-metal sealing has long been a primary method for hermetically isolating hybrid components from potentially harsh environments in which these devices are used. The hermeticity, strength and voltage breakdown of these seals directly effect the reliability of the components of which they are a part and, henceforth, can cause or prevent potentially catastrophic component failure, Furnace atmosphere requirements for both matched and compression types of sealing vary for the three production process steps; degassing, oxidation and sealing. The research presented here is centered around the precise control of the oxidation through the use of a humidified H₂O-H₂furnace atmosphere to investigate the effects of oxide layer formed at the glass-metal interface on voltage breakdown characteristics. To produce consistently reliable seals with the good voltage breakdown property, precise blending of the furnace atmosphere including H₂O-H₂gas mixture should allow repeatable limits in which the depth of oxide layer is determined below 11㎛. This improved process relies on more precise control over furnace atmosphere composition to produce a more reliable product at higher levels of consistency than have been previously realized by the industry.

溶融鹽 中에서 鐵系素地金屬의 A1 메탈라이딩에 關한 硏究

梁在雄,安在禹,李煥哲 대진대학교 1995 大眞論叢 Vol.3 No.-

A new coating process known as metalliding has been adopted to have the diffusion coating of aluminium on steel from molten fluorides(29.2wt.% LiF-11.7wt.% NaF-59.lwt.% KF, FLINAK). Experiments were carried out in argon gas atmosphere. The electrolytic cell consists of a steel cathode and a consumable aluminium anode. The reagents were vacuum dried to remove the moisture for 24hrs. at 400 C and the electrolyte was pre-electrolyzed to remove residual impurities. The influence of the co-deposition of manganese was also investigated. The quality of deposit was analyzed by SEM, EPMA and also examined by Micro-Vickers hardness, and corrosion tests. Deposit layer was identified as an aluminium-rich iron alloy layer caused by diffusion process. The optimum condition for the metalliding was found to be the bath temperature, 575℃, the amount of AlF_(3), l0wt.%, and the current density, 50 to 150mA/cm^(2). Addition of manganese fluoride (up to 5wt.%) as a co-deposit element improved significantly the quality of deposit layer.

초대마모 Clad판재의 기계적 성질에 관한 연구

양재웅 대진대학교 첨단소재연구소 1998 첨단소재연구소논문집 Vol.1 No.-

The overlay welding was performed by an automatic submerged arc welder equipped with the cooling and jig system to minimize the dilution of cladding metal and as well as to prevent the distortion of base plate. Effects of welding conditions on mechanical properties of clad plate were evaluated by means of tensile test, impact test and fracture toughness test, and also the workability and the abrasive wear resistance were examined. Fractures were observed at the side of ductile base steel after tension test however at the side of brittle clad metal after impact test. In fracture toughness test, it was found that crack was propagated along with martensite of the region confined to a very narrow interface of ferrite and austenite. Results of the evaluation were followed; Tensile strength; ????=38.35㎏/㎟, ????=32.95㎏/㎟ Impact absorbed energy; K??=2.5J/㎠ (Clad1), 1.9J/㎠ (Clad2) Fracture toughness; ????=0.3 ㎏/㎜ (Clad1, Clad2) The bend and wear test of the clad plate showed good workability and high abrasive wear resistance.

Kanthal이 매몰된 세라믹히터의 열팽창 특성에 관한 연구

양재웅 대진대학교 2000 大眞論叢 Vol.8 No.-

Ceramic heater in which heating elements are embedded is known as the good efficient heater with a good reliability and stability in service and a wide uniform zone at high temperature, thereby improving the value in use at severe atmosphere. It is important to determine the optimum condition of manufacturing the ceramic heater to be fit to use in long times without crack initiation, when used in many recycling services. With Kanthal wire as the heating element embedded in ceramic core, in varying the each process condition such as the mixing of clays and ceramics, the drying and sintering of core, various specimen were prepared. Each specimen was tested by the dilatometer to investigate the thermal expansion coefficient. The results of this research were as follow. I chose Arrundum 70%, clay 16% (Kaolin : 7% & ball-clay : 9%) and Carborundum 14% as the refractory materials, and mixed well, pasted it with water and formed the core in which the curled heating element covered with poly-ethylene cord was embedded. It is dried at 150 ℃ for 7 hours and sintered at 1250 ℃ for 3 hours. The ceramic heater manufactured through this process had the best property of thermal expansion. Thermal expansion coefficient was 9-16*10^(-6)/K and thermal expansion ratio was 2.0% at 1000 ℃ and difference of shrinkage ratio was only +0.02% at 400 ℃, futhermore this ceramic heater had no crack even after recycling heat treatment.

Virus로 因한 眼疾의 最新知見

梁在雄 대한의학협회 1962 대한의학협회지 Vol.5 No.6

葡萄膜炎(內因性)의 治療

梁在雄 大韓眼科學會 1962 大韓眼科學會雜誌 Vol.3 No.1