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신경회로망을 이용한 Al 2024-T3 합금의 피로손상모델에 관한 연구
홍순혁,조석수,주원식 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.4
To estimate crack growth rate and cycle ratio uniquely, many investigators have developed various kinds of mechanical parameters and theories. But, these have produced local solution space through single parameter. Neural Networks can perform pattern classification using several input and output parameters. Fatigue damage model by neural networks was used to recognize the relation between da/dN/ N/N_f, and half-value breadth ratio B/Bo, fractal dimension D_f and fracture mechanical parameters in 2024-T3 aluminium alloy. Learned neural networks has ability to predict both crack growth rate da/dN and cycle ratio N/N_f within engineering estimated mean error(5%)
朝鮮朝 光海君代의 宮闕建築에 관한 硏究 : 仁慶宮과 慶德宮을 중심으로
洪錫珠 대한건축학회 2003 대한건축학회논문집 Vol.19 No.5
During the years of KwangHaeGun, an active public services of building large scale palaces such as reconstruction of ChangDukGung and ChangKyungGung and new construction of InKyungGung and KyungDukGung were carried out. Especiallly what is distinctive is that during the years of KwangHaeGun, Dang(堂) acting as a PyunJun, is located in front of JungChimJun(正寢殿). This made JungJun and PyunJun a WaeJun(外殿) therefore clearly dividing boundary area of NaeJun and WaeJun. Since Sejong dynasty, functions of king and queen was starting to differentiate, that during the years of KwangHaeGun, two ChimJun(寢殿) was made. Therefore, other than queen's ChimJun, (also called JungChimJun(正寢殿)), king's JungJun was placed. To perform big events at the palace, a WolDae(base) was needed, therefore they put in front of JungChimJun(正寢殿). King's ChimJun located near the area of WaeJun(外殿). And King's ChimJun constructed during the years of KwangHaeGun is assumed to be built on stone pillars(石柱).
홍순혁,이동우,허건,조석수,주원식 동아대학교 생산기술연구소 2000 生産技術硏究所硏究論文集 Vol.5 No.1
Ultrasonic inspection of defects has been focused on the existence of defect in structural material and need has much time and expenses in inspecting all the coordinates (x, y) on material surface. Neural networks is information processing system modeling human brain and can have an application to coordinates (x, y) of defects by multi-point inspection method. Ultrasonic inspection modeling is optimized by neural networks which makes defect echo, back-wall echo and ultrasonic transducer units of input layer and absolute and relative coordinates of defects and defect pattern units of output layer. This method can predict coordinates (x, y) of defects within engineering estimated mean error Ψ.
홍석우,주인곤,임종철 釜山大學校生産技術硏究所 1996 生産技術硏究所論文集 Vol.50 No.-
그리운드 앵커의 시공이 나날이 증가되고 있는 현실에서, 연약한 지반에도 시공 가능한 지반개량앵커(SI 앵커)의 정확한 극한인발력의 산정과 인발저항기구를 연구하는 일은 매우 중요한 일이다. SI 앵커는 지반개량앵커를 의미한다. 앵커를 지지하는 지반을 J.S.P 로 개량한 짓이다. SI 앵커는 인발저항기구를 알기 위해 SI 앵커체의 표면과 앵커체 두부의 응력을 측정하는 것이 필요하다. 본 연구에서는 현장실험과 실내모형실험을 통해 SI 앵커체 표면에서의 응력을 측정했고, 산정식에 의한 계산 결과치와 비교했다. 본 연구의 결론은 다음과 같다. (1) SI 앵커의 거동은 일반 마찰방식 앵커의 거동과는 다르게 나타나는데, 이는 SI 앵커의 저항력은 지압저항력과 마찰 저항력의 합에 의해 결정되기 때문이다. (2) SI 앵커의 설계 시는 진행성 파괴의 영향을 고려하여야 한다. (3) SI 앵커의 지압저항에 의해 앵커두부의 변위는 감소되고, 앵커의 극한인발력은 일반마찰방식앵커에 비해 증가한다. (4) SI 앵커는 일반앵커가 시공되기 어려운 연약지반 내에 정착할 때 특히 효과적이다. Day after day, use of ground anchor is increasing in execution, It is significant to calculate the ultimate pullout force exactly and to research the mechanism of pullout resistance of SI anchor. SI anchor means the Soil Improvement anchor. Ground for anchoring is improved by J. S. P. In order to analyze the mechanism of pullout resistance of SI anchor, it is necessary to measure stresses on the SI anchor surface and SI anchor head. In this study, we measured stresses on the SI anchor surface by field tests and laboratory model tests and compared with calculated results. The conclusions of this study are as follows: (1) The behavior of SI anchor is different from that of friction anchor, because pullout resistance of SI anchor is made by bearing and frictional force. (2) In the design of SI anchor, progressive failure should be considered. (3) By the bearing resistance of SI anchor. the displacement of anchor head is decreased and the ultimate pullout force of anchor is increased comparing with general friction anchor. (4) SI anchor can be used in soft ground effectively.
새로운 방법에 의한 1,1-R,R'-2,3,4,5-테트라페닐-1-실라사이크로펜타디엔의 합성
주완철,흥장환,최석봉 성균관대학교 기초과학연구소 1988 論文集 Vol.39 No.1
A new synthesis of 1,1-R, R',-2, 3, 4, 5-tetraphenyl-1-silacyclopentadiene was described. It was synthesized from one-pot reaction of 1,4-dilithio-1, 2, 3, 4-tetraphenylbutadiene with R_nSiCl_4-n (n=0, 1, 2), where 1, 4-dilithio-1, 2, 3, 4-tetraphenyl butadiene was prepared from the reaction of diphenyl acetylene and lithium metal in ether solution with good yield (80∼85%).
탄소성 변형을 받는 냉간 압연강의 X선 잔류응력 특성에 관한 연구
홍순혁,이동우,양광호,조석수,주원식 동아대학교 생산기술연구소 2000 生産技術硏究所硏究論文集 Vol.5 No.1
In textured material, diffraction angle 2θ usually shows a nonlinear relation against sin^2Ψ due to elastic anisotropy of crystals. SPHD and SPCD steel is cold-rolled carbon steel for automobile. The characteristics X-ray for stress measurement is Cr K_α and Mo K_α1characteristic X-ray. The sin^2Ψ-2θ diagram under elastic strain seems to have a linear behavior using regression line of data but has a nonlinear behavior in distribution of data by Cr K_αcharacteristic X-ray. As the plastic strain of specimen increases, the nonlinearity of 2θ with respect to sin^2Ψ increases remarkably. On the other hand, the diffraction angle 2 θ by Mo K_α1 characteristic X-ray shows a good linearity on sin^2Ψ-2θ diagram under plastic strain as well as elastic strain. Therefore, This paper presents the measurement of residual stress in cold-rolled carbon steel for automobile using penetration depth of Mo K_α1 charateristic X-ray and multiplicity factor of crystal diffraction plane.
MgCl₂溶液內에서 STS 304 HP Stainless Steel 熔接部의 破壞擧動에 對한 硏究
金永奭,丁太權,朴昌彦,洪錫柱,梁仁榮,金基玉,朴煥奎,李茂錫,曺圭宰,鄭在康 조선대학교 생산기술연구소 1983 生産技術硏究 Vol.1983 No.-
This paper is based on an experiment analysing the stress corrosion cracking behaviour of welding specimens compared to that of non-welding specimens of STS 304 HP stainless steel in corrosion solution. As a corrosion condition, stainless steel has been known to be the most fragile in a solution of 42% MgCl₂heated to the boiling point, therefore the experiment was carried out in this condition. The experiment was carried out with argon gas TIG welding specimens and non-welding ones made of stainless steel plates, thickness 2mm, by tensile force. At this time, the tensile force was taken to be the value of the yield strength of the tensile test specimens divided by the safety factor of 3.0 to 3.5, 4.0, 4.5, and 5.0. In this paper, the relations between Time of Initial Crack, Time of Failure, Time of Final Fracture and Crack Propagation Length were investigated and then plotted. Furthermore, the relations between Stress Intensity Factor K proposed by Irwin and the Time of Initial Crack, the Time of Failure, the Time of Final Fracture were calculated and plotted. At the last, all the relations plotted were expressed to normal equations by computer, and the equations were used to analyse the data obtained in the experiment. The conclusions obtained in this study are as follows: 1. Welding materials, compared with non-welding ones, as the Time of Initial Crack, the Time of Failure, and the Time of Final Fracture were generally very fast, appeared to be a phenomenon of unstable brittleness fracture. 2. Non-welding materials, compared with welding ones, as the safety factor was larger or the working stress was smaller, appeared to be a phenomenon that the longer had had greater durability. Therefor, welding materials must be considered enough to be used in heate affected and stress corrosion atmosphere. 3. The normal equations of the Time of Initial Crack and the variation rate to the same Stress Intensity Factor K are as follows: (A) Non-welding T =259702.4-5451.2 K+28.386 K² T = -5451.2+28.386 K (B) Welding T= -332.693+28.043 K-0.211 K² T' =28.043-0.211 K here, T; Time of Initial Crack, T'; Variation Rate of Time of Initial Crack to Stress Intensity Factor K, K ; Stress Intensity Factor.
서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)
김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1
In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.