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Jae‑Gil Jung,Young‑Hee Cho,Tae‑Young Ahn,Jae‑Hee Yoon,Sang‑Hwa Lee,Jung‑Moo Lee 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.5
The correlation between primary Si and silicide refinement induced by ultrasonic treatment (UST) of multicomponent Al–Sialloy containing Ti, Zr, V, and P was investigated. UST significantly refined the primary Si phase owing to cavitation-inducedwetting and deagglomeration of MgAl2O4particles. Lowering the UST finish temperature caused deterioration of the degreeof primary Si refinement, instead leading to silicide refinement. Cavitation-induced silicide nucleation on wetted MgAl2O4consumed the MgAl2O4particles, particularly in the case of primary Si nucleation. Similarly, the formation of an AlP phaseon the silicide phase reduced the nucleation efficiency of the AlP phase. Poisoning of the MgAl2O4and AlP phases by thesilicide phase was responsible for the deterioration in primary Si refinement. Room-temperature tensile strength and hightemperatureelongation were increased by UST and were dependent on the size of primary Si.
작업의 특성에 종속되는 병렬기계의 일정계획을 위한 발견적 기법
이동현,이경근,김재균,박창권,장길상 한국경영과학회 2000 經營 科學 Vol.17 No.1
In the real world, situations that some jobs need be processed only on certain limited machines frequently occur due to the capacity restrictions of machines such as tools, fixtures, or material handing equipment in this paper, we consider n-job, non-preemptive and m parallel machines scheduling problem having two machines group The objective function is to minimize the sum of earliness and tardiness with different release times and due dates The problems is formulated as a mixed integer programming problem The problem is proved to be NP-complete Thus, a heuristic is developed to solve this problem To illustrate its suitability and efficiency, a proposed heuristic is compared with a genetic algorithm and tabu search for a large number of randomly generated test problems in ship engine assembly shop Through the experimental results, it is showed that the proposed algorithm yields good solutions efficiently
납기와 조립가능 시점을 고려한 병렬기계의 스케쥴링을 위한 발견적 해법
이동현,이경근,김재균,박창권,장길상 한국경영과학회 2000 한국경영과학회지 Vol.25 No.2
In this paper, we consider an n-job, non-preemptive and identical parallel machine scheduling problem of minimizing the sum of earliness and tardiness with different release times and due dates. In the real world, this problem is more realistic than the problems that release times equal to zero or due dates are common. The problem is proved to be NP-complete. Thus, a heuristic is developed to solve this problem. To illustrate its suitability, a proposed heuristic is compared with a genetic algorithm for a large number of randomly generated test problems. computational results show the effectiveness and efficiency of proposed heuristic. In summary, the proposed heuristic provides good solutions than genetic algorithm when the problem size is large.
이길영,허재영,박승기 大田大學校 産業技術硏究所 1996 산업기술연구소 論文集 Vol.7 No.2
The regional unbalance of water quantity and the deterioration of water quality become pending problems that should be solved. Although monthly streamflow data have been used in most water resources plannings to cope with the problems, for more effective management of confined water resources the exact calculation of daily droughtflow is essential. In this study, the droughtflows at Backokpo watershed in Han River were measured from May 1993 to May 1994 and the relations between drogughtflow and the hydrogeological character of the watershed were figured out.
이행남,박길문,이덕구,정한별,김건일,설재림 朝鮮大學校 機械技術硏究所 2005 機械技術硏究 Vol.8 No.1
The sirocco fan is used to get low noise, and it has been applied to a lot of industry field like the heat engine, the fluid instrument power plant, the food industry, environment industry etc... because there are not problems even it is mixed with a any kind of liquid, gas, and solid. The flow characteristics in sirocco fan are investigated by PIV. The experiment using PIV measurement for Test section's flow characteristics acquired velocity distribution, Condition : when sirocco fan in automobile air controller maximum 1450RPM, and a revolution is a variation (l)950RPM, (2)l100RPM, (3) 1250RPM. The agreement a experiment shows the validity of this study and the results of this study would be useful to the engineers who design for the flow systems
원심모형시험에 의한 복개터널 복공의 토압특성에 관한 연구
이명욱,박병수,정길수,유남재 江原大學校 産業技術硏究所 2004 産業技術硏究 Vol.24 No.B
This thesis is results of experimental works on the behavior of the cut-and-cover tunnel. Centrifuge model tests were performed to simulate the behavior of the cut-and-cover tunnels having cross sections of national road and subway tunnels. Model experiments were carried out with changing the cut slope and the slope of filling ground surface. Displacements of tunnel lining resulted from artificially accelerated gravitational force up to 40g of covered material used in model tests, were measured during centrifuge model tests. In model tests, Jumunjin Standard Sand with the relative density of 80 % and the zinc plates were used for the covered material and the flexible tunnel lining, respectively. Basic soil property tests were performed to obtain it's the property of Jumumjin Standard Sand. Shear strength parameters of Jumunjin Standard Sand were obtained by performing the triaxial compression tests. Direct shear tests were also carried out to find the mechanical properties of the interface between the lining and the covered material. Compared results model tests estimation with respect to displacements of the lining.
미소원공결함을 갖는 차량 밸브용강재의 피로크랙진전거동에 관한 연구
이동길,이상열,정재강 朝鮮大學校 機械技術硏究所 2001 機械技術硏究 Vol.4 No.1
본 연구에서는 자동차 밸브에 사용되고 있는 내열강 STR3과 STR35를 마찰용접한 후 모재, 열영향부 및 접합선(bond line)에 미소 인공결함을 가공하여 피로크랙 발생 및 전파 거동, 피로수명 및 기계적성질의 상관관계를 조사하는 연구를 수행하였다. 평활재의 피로한도시험 결과 STR3의 피로한도는 429.0MPa이며, STR35는 409.4MPa로서 항복강도가 높은 STR3의 피로한도가 약 20MPa이 높게 나타났다. 미소원공결함이 접합선으로부터 1.0mm떨어진 곳에 가공된 시험편의 피로수명은 모재보다 STR3은 약99%, STR35는 약 25%씩 증가한 반면 접합선에 미소원공결함이 가공된 시험편은 모재보다 STR3은 약 20%, STR35는 약 72% 감소하였으며 파괴전 관찰된 최종크랙길이도 크게 감소하였다. 또한 피로크랙길이와 파단수명비의 관계식에 본 시험재료를 적용한 결과 마찰용접 및 미소원공결함의 위치에 관계없이 비례관계가 있음을 알 수 있었다. The fatigue crack propagation characteristics were investigated for two kind of heat-resisting steel, STR3 and STR35, commonly using in valve material of vehicles, in order to evaluate the fatigue crack propagation behavior and fatigue life of dissimilar friction welding zone. The fatigue limits of the as-received specimens, STR3 and STR35, were 429MPa and 409.4MPa respectably. The fatigue life of the specimen showed about 99.1% for STR3, about 25.2% for STR35 higher than that of the base metal specimen. But the fatigue life of bond line notched specimen was shown about 20% for STR3 and about 72% for STR35 shorter than that of the base metal specimen.
李栽吉 군산대학교 1993 群山水産專門大學 硏究報告 Vol.27 No.1
The health care consists fo the health exemination, preventive medicine, therapeutics epidemic prevention, first-aid treatment, etc. This thesis studies the first-aid treatment for the bone-inframmation in the joints of the body. Also, this thesis, being on the basis of the acupuncture and moxacatery, studies the treatment effects of the finger-pressure therapy for the bone-inflammation in the shoulder, finger, ankle, and the disjoint of the shoulder as a first- aid treatment.
온도변화에 따른 알루미늄합금 용접부의 피로수명에 관한 연구
이동길,양승훈,김건호,정재강 朝鮮大學校 機械技術硏究所 2002 機械技術硏究 Vol.5 No.1
본 연구에서는 저온용기 등에 많이 사용되고 있는 알루미늄 합금 A15083-0재에 대한 보호가스 혼합비율과 피로수명과의 관계를 규명하고자 혼합가스 비율을 여러 가지로 달리하여 GMA 용접을 실시하였다. 시험온도는 상온에서 극저온까지 단계적으로 낮추어가며 실시하였다. 용접재의 피로수명은 모든 불활성가스 혼합비율 및 노치 가공위치에서 모재보다 높은 피로수명을 보였으며, 영향부, 용융선 및 용착금속부 순으로 피로수명이 증가하였다. 상온에서부터 -85℃까지는 온도가 낮아짐에 따라 피로수명은 모재 및 Ar33%+He67%의 경우 증가한 반면, 다른 불황성 가스혼합비에서는 감소하는 경향을 나타내었며, -196℃ 극저온에서는 피로수명 크게 증가하여 저온재료로서 유용한 성질이 나타났다. The influence of mixing shield gas ratio and test temperature on fatigue life of welding zone were examined experimentally for a AI5083-O aluminum alloy. The GMA(Gas Metal Arc) welding was carried out for weld specimen with various mixing gas ratio(Ar100% + He0%, Ar67%+He33%, Ar50%+He50%, and Ar33%+He67%). The tested temperature range was from room temperature(+25℃) to cryogenic temperature(-192℃). The welding zone was divided into four sub-zones for analysis ; weld metal, fusion line, HAZ, and base metal. In the influence of mixing gas ration, fatigue life of weld metal was decreased with higher Argon gas ration, but fusion line and HAZ specimens were not influenced greatly, The fatigue life increased at lower temperatures, particularly at -196℃. It was known availability that the A15083-O is appropriate for used low temperature material.