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

[기술기사①] 프리캐스트 콘크리트 블록식 옹벽의 거동분석

오세욱,이종규,강종범 한국지반환경공학회 2003 지반환경 Vol.4 No.2

계장화충격시험에 의한 복합조직강의 파괴인성에 관한 연구

오세욱,유재환,박원조,이경봉 동아대학교 공과대학 부설 한국자원개발연구소 1989 硏究報告 Vol.13 No.1

The dynamic fracture toughness (K_(Id)) is measured using the precracked standard Charpy specimen with an instrumented impact machine. The value of K_(Id) is determined as a function of yield strength and microstructure, and correlations are established between K_(Id) and both energy of initial fracture and total energy of fracture. Since the K_(Id) values of the precracted impact specimens are in accordance with their theoretical ones, this test method is sufficiently practical.

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.

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.

[특집ㅣ지반공학에서의 Bio-engineering] Soil Bioengineering을 이용한 사면안정화 기술

오세욱,이종규 한국지반환경공학회 2003 지반환경 Vol.4 No.3

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'.

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.

打擊速度 및 溫度變化가 豫크랙을 가진 衝擊試驗片의 動的破壞靭性에 미치는 影響

兪在煥,李敬奉,金重吉,李致雨,吳世旭 慶南大學校 附設 工業技術硏究所 1989 硏究論文集 Vol.7 No.-

計裝化衝擊試驗에서 打擊速度와 溫度의 變化가 豫크랙을 揷入한 衝擊試驗片의 動的破壞靭性에 미치는 影響을 考察한 結果 다음을 알 수 있었다. 豫크랙을 揷入한 試驗片이 V-노치 試驗片에 比하여 實驗値의 分散度가 적으며 0℃以下의 溫度領域에서 動的破壞靭性의 有效性이 있었다. 또한 打擊速度와 實驗溫度의 影響은 溫度가 速度보다 훨씬 上廻하는 傾向이었다. The effect of various impact velocity and temperature on dynamic fracture toughness is tested with precracked Charpy specimen, and conclude following results. Precracked specimen has less dispersion of test results than V-notched specimen, unstable crack initiation load didn't agreed to maximum load at room temperature but at 0℃ below, thus, the availability of dynamic fracture toughness is relatively high. Comparing V-notched specimen, the precracked Charpy specimen represented lower shelf of temperature different. But, at this time, the absorbed energy is estimated equivalently. With the decrease of temperature, the reduction of fracture toughness was obvious, but the effect of impact velocity didn't appear.