주식회사설립에 있어 실제는 발기설립이나 형식상 모집성립의 절차를 취한 경우의 법률관계 - 대법원 1992.2.14 선고 91다 29347 판결 -

오세욱 한국사법행정학회 1992 사법행정 Vol.33 No.11

컴퓨터 시뮬레이션을 이용한 임플란트 상부 티타늄 구조물의 주조방안

오세욱,이호용,이근우,심준성,Oh Se-Wook,Lee Ho-Yong,Lee Keun-Woo,Shim Jun-Sung 대한치과보철학회 2003 대한치과보철학회지 Vol.41 No.4

Statement of problem : It is difficult to obtain a good titanium casting body using the traditional sprue design because of high melting point of Ti, and the low fluidity and high reactivity of molten Ti. Purpose : A new sprue design for titanium casting bodies needs more trial and error. In order to decrease the number of trial and error, computer simulation(MAGMASOFT, Magmasoft Giessereitechnologie GmbH, Achen, Germany) was used to optimize sprue design in U-shaped implant superstructures. Material and method : Five kinds of sprue were examined for the design of the sprue former for titanium casting: Sprue design A(sprue length 4 mm, rectangular shape, 4 sprues), Sprue design B(sprue length 4 mm. round shape. radius 2 mm, 7 sprues), Sprue design C (sprue length 2 mm, round shape, radius 2 mm, 7 sprues). Sprue design D (sprue length 2 mm, cone shape, large radius 3mm. small radius 2mm, 7 sprues), and Sprue design E( sprue length 2 mm. one unit channel shape). Sprue design F(sprue length 2mm, one unit channel shape) was also examined for the design of the customized sprue former in the Biotan system(Schutz Dental Gmbh, Germany). The casting bodies were taken in Sprue design A, Sprue design D, Sprue design E, and Sprue design F in the Biotan casting system. The numerically predicted defects were compared with the experimental dental castings by the radiographic and sectional view observations. Results : 1. According to the result of computer simulation, turbulence during mold filling was decreased in the sequence of Sprue design F, Sprue design E, Sprue design D, Sprue design C, Sprue design B, and Sprue design A. 2. The calculated solidification time contours indicate that hot spot was moved from the casting body to the sprue button in the sequence of Sprue design A, Sprue design B, Sprue design C, Sprue design D, and Sprue design E. The filling pattern of Sprue design F was similar to that of Sprue design E. 3 The predicted filling pattern shows that less turbulence was found in the customized sprue former than in the standard sprue former. 4. According to the results of the radiographic and cross sectional observations, casting defects less than 1mm were found at the center of a casting body with Sprue design E and Sprue design F. However, larger casting defects of 4mm were found in a casting with Sprue design A. 5. The predicted casting porosity was similar to that of the real casting. Conclusion : One unit channel-type and customized sprue former can be recommended. Further research and developement of various sprue designs using computer simulation in necessary to optimize casting design, in order to reduce the formation of casting defects in implant titanuim super-structures.

SB41鋼 潛弧熔接部의 平滑 및 側面홈에 관한 疲勞크랙 傳播特性 : 大氣雰圍氣下에서의 擧動 at Room Temperature in Air

吳世旭,金在喆,李祥源 동아대학교 공과대학 부설 한국자원개발연구소 1986 硏究報告 Vol.10 No.2

Fatigue test was conducted on the smooth and side-grooved specimens fabricated from submerged are welded plate of SB41 steel. Test conditions were constant-loan-amplitude fatigue crack growth test with stress ratio 0.1, loading frequency 5㎐, sinusoidal waveform at room temperature in air. The results are summarized as follows: 1) Fatigue crack growth rate of weld metal is slightly lower than that of base metal. 2) Due to the effect of plastic constraint, side-grooved specimen shows somewhat faster fatigue crack growth rate than smooth specimen. 3) Welding residual stress affects fatigue crack growth rate.

單一試驗片의 安定히스테리시스 曲線에서 金屬의 硬化指數 推定에 관한 硏究

吳世旭,金在喆 동아대학교 공과대학 부설 한국자원개발연구소 1986 硏究報告 Vol.10 No.1

Fully reversed pull-push low cycle fatigue test under triangle cyclic waveform mode of constant strain control were conducted for SM15C and copper at the room temperature in air. Cyclic strain hardening exponent, n' was obtained from the cyclic δ-ε curve defined as the locus of tips of the stable hysteresis loops. Equivalent cyclic strain hardening exponent, n'_(eq), was obtained from the outer trace of a single stable hysteresis loop. Modified equivalent cyclic strain hardening exponent, n'_(eqm) , was obtained from the outer trace of a single stable hysteresis loop in the modified coordinate system. The relationship between n'_(eq), n'_(eqm), and n' was investigated with the test results. Equivalent cyclic strain hardening exponent n'_(eq) is considerable dependent upon the controlled strain range Δ^(ε) and decrease with increase of Δ^(ε). If Modified equivalent cyclic strain hardening exponent n'_(eqm) is calculated from the stable hysteresis loop at the modified coordinate system translated along the elastic slope, it closely approach to cyclic strain hardening exponent n'.

複合組織鋼의 回轉굽힘 疲勞크랙發生 및 傳播에 미치는 母相粒徑의 影響

吳世旭,金雄執 동아대학교 공과대학 부설 한국자원개발연구소 1984 硏究報告 Vol.8 No.1

The weight reduction and reliability of various steel used in industrial machinery have become a great importance as industry developes. For this reason a study on dual phase steel has been consisted different size of ferrite grain which has approximatly the constant plastic constraint effect and internal stress through heat treatments. They were prepared to able to apply the stress intensity factor equation K=σ√πℓ to the hollow shaft as assuming infinite plane without residual stress. Especially, it is possible to reduce the weight in hollow shaft and this hollow shaft is largely expected contribution in the machines operated with high speed or design manufacturing of aeronautical eguipments. Therefore, the fatigue crack behavior and fractography on the high-low stress level of M.E.F dual phase steel by rotary bending fatigue test were discussed. The results of the experiment are as follows. 1. The fatigue durability of the M.E.F dual phase steel is 1.6~1.8times greater than mild steel. 2. The initiation fatigue crack of the M.E.F dual phase steel and mild steel was created within 21~23%, 9% of fracture number of revolutions. 3. The smaller ferrite grain size is increased to m, decreased to C and located to high K range in M.E.F dual phase steel. 4. The fatigue and tensile fracture surface formed dimple facet and river pattern in M.E.F dual phase steel.

精密鑄造法의 硏究 : on the Shell Molding Process Shell Molding Process에 關하여

吳世旭 東亞大學校 1964 東亞論叢 Vol.2 No.2

The mass production and the progress of accurate castings are more asked for recently, and especially the superhard refractory alloy is more widely used according to the modern industrial development,but the casting and its machining have become very harden to be worked. And so nowadays we need the higher accuracy of casting practice. Shell molding process has been held very important as a new technical development of every foundry in the world for recent years,because the process is high-accurate,high-efficient and very regular and also it admit the capability of mass production of castings. The author has experimentally studied in this process energentically and continuously since May 1959, and he is quite sure that it is possible to industrialize the process in Korea. Of course we have still many problems not to be solved about the shell molding process even in the extreme of casting skill. Howeven we must not be backward in the advanced foreign casting skills and we must reform and develop our casting skill in Korea by developing more the method of the shell molding process. Shell mold casting is the process that uses a relatively thin-wall mold made by bonding silica or zircon sand with a thermosetting phenolic or urea resin. It has gained wide spread use because these castings offer many advantage over con-ventional sand casting. Shell mold casting is a practical and economical way to meet the demand for weight reduction, thinner sections, and closer toerances. The same materials can be cast by the Shell molding process as are cast in green sand molds. Use of the shell mold casting process provides following advantage; (1) High production rates and fewer finishing operations result in a lower unit cost for applicable parts. (2) Shell castings are made to closer tolerances than sand castings. (3) Shell molding provides an improved surface when compared with sand casting. (4) The greater precision of shell molding reduces and, in many cases, eliminates machining or grinding operations. (5) The insulating properties of the molds produce casting surface free of chil and with a more unifom grain structure. Although a shell mold is more expensive than a green sand mold, the possi-bility of reducing weight, minimizing machining and eliminating cores often results in savings sufficient to offset the mold cost.

複合組織鋼의 母相粒徑이 乾式로링 磨耗特性에 미치는 影響

吳世旭,姜鎬珉,金時綜 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.2

The wear specimens of M.E.F. steel were conducted by Amsler type abrasive test machine under sliding ratio 9 09%. The relationship between weight loss ratio of wear, rolling life and scanning electron microscope investigation of micro wear surface was investigated during the test. The results of the experiment are summarized as follows. The amount and the weight loss ratio of the rolling wear are decreased when tensile strength is high and the amount of rolling wear of M E F. steel is lower than that of raw materials. As the ferrite grain size of M E F. steel is small, the amount and the weight loss ratio of the rolling wear are decreased. The amount of rolling wear is increased with increasing rolling revolution and wear of dual phase steel under dry rolling condition is characterized by three modes, initial, stationary wear and abnormal wear. Abnormal wear is caused by pitting occurrence on the exfoliation of sub-surface layer because of compression, shear, sliding of this wear surface. The wear surface condition is getting better as the ferrite grain size is getting smaller, which is caused by the promotion of the second phase sketetal strength.

SUS 316 강의 온도의존성 결정입경이 크리이프 거동에 미치는 영향

오세욱,강욱,Oh, Sae-Wook,Kang, Oug 대한용접접합학회 1983 대한용접·접합학회지 Vol.1 No.2

Austenitic stainless steel has been investigated widely for creep strength of heat resistant material and effects of grain sizes due to various solution treatment time under constant temperature. It was studied that effects of grain sizes subject to solution treatment temperature 1100.deg. C, 1125.deg. C, 1175.deg. C, 1250.deg C, and 1300.deg. C respectively on the creep strength, fracture behaviour and fractography of SUS 316 stainless steel. The experimental results obtained were as follows. 1. The optimum grain size for the maximum creep strength did not vary with creep testing temperatures and stress levels. 2. Among various grain sizes due to different solution treatment temperature, the optimum grain size for the creep strength was found 0.044mm. Also the size showed the minimum initial strain regardless creep temperature. 3. Garofalo's equation of creep rupture life was applied well to SUS 316 stainless steel. 4. The fractography of optimum size was ductile intergranular fracture of dimple type and showed along with the increase of grain size intergranular fracture of w type.

생활.상식 - 아이스크림의 유통기한 바로 알자

오세욱,Oh, Se-Uk 한국식품연구원 2008 한맛한얼 Vol.1 No.2

알고리즘으로 본 유튜브의 미디어 지향

오세욱 관훈클럽 2019 관훈저널 Vol.- No.150