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Prediction of Grain Structure of Thin Bronze Slab Produced by Horizontal Continuous Casting
Yong‑You Kim,Hee‑Soo Kim 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.2
The grain structure of a thin bronze slab produced by horizontal continuous casting was investigated using heat-transfercalculation and cellular automaton (CA). The composition of the bronze was Cu–22wt%Sn, which has been widely used inKorean history. The solid form of Cu–22wt%Sn was assumed as a single phase for simplicity. To simulate the macrostructureof the alloy, the heat transfer in the horizontal continuous casting was calculated as a steady-state one-dimensional lumpedsystem. The CA was used for simulating the grain structure. Since the temperature profile was in the steady state, the cellinformation was shifted along the casting direction at a rate of one cell per time step during the simulation. The grainswere nucleated at the slab surface and grown as columnar grains. The effects of the process parameters, such as initial melttemperature and casting speed, on the grain structure of the slab were investigated. It was found that the casting speed is acritical factor determining the angle between the columnar grains and the casting direction.
유용식 우송대학교 2003 우송대학교 논문집 Vol.8 No.-
This study is purposed to make clear present conditions and problems of the faculty work evaluation and faculty annual salary, executing of the faculty work evaluation and faculty annual salary. For that purpose, this study inspected the presents condition of faculty work evaluation, and investigated structural elements and framework of annual salary. In conclusion, this study proposed the condition to hope for executing of the faculty annual salary
소목(Caesalpinia sappan) 추출물의 Streptococcus mutans에 대한 성장, 산생성, 부착 및 비수용성 글루칸 합성 억제에 미치는 영향
유용욱,유현희,김윤정,유미선,서세정,이황,이흥수 대한구강보건학회 2003 大韓口腔保健學會誌 Vol.27 No.2
Streptococcus mutans is known as the causative bacterial playing the most important role in forming plaque and it is being noticed as major causative bacteria of dental caries. Therefore, development of more effective, substantial and safe preventive agent against dental caries and periodontal disease is honestly required. The present study was designed to investigate the effect of chloroform extract(CE), n-butanol extract(BE),methanol extract(ME) and water extract(WE) of Caesalpinia on the growth, acid production, adhesion, and insoluble glucan synthesis of Streptococcus mutans. The CE, BE, ME and WE decreased the growth and acid production of S.mutans than that of control, especially, the ME was more effective than other extracts. The effect of CE, BE, ME and WE on the adherences to saliva-coated hydroxyapatite bead(S-HA) were evaluated. At the concentration of 2,000 ㎍/㎖, the CE showed 32% rate of bacterial adherence to S-HA, whereas, other extracts of the same concentration producedgreater than 50% rate. The CE and BE were significantly decreased the reduction rates of water insoluble glucan formation from sucrose by crude glucosyltransferase of S.mutans. Thus, the application of C. sappan can be considered a useful and a practical method for the prevention of dental caries.
연속파형 Nd:YAG 레이저를 이용한 SM45C 용접특성
유영태,노경보,오용석 朝鮮大學校 機械技術硏究所 2002 機械技術硏究 Vol.5 No.2
The Nd:YAG laser in combination with the optical fiber increase the automation and the flexibility of a whole industry. The Nd:YAG laser welding process in one of the most advanced manufacturing technologies owing to its high speed and penetration. This paper describes the weldability of SM45C carbon steel for machine structural use by Nd:YAG laser. Major process parameters were position of focus, travel speed and laser power. The results showed that peneration depth of the weld was increased with increasing applied laser power. Microstructural examinations and calculations and indicated that the microstructure of the laser weld, which experienced very high heating and cooling cycle during welding process. The results of this study provide application possibility of Nd:YAG laser welding for SM45C carbon steel
유용식 우송대학교 2004 우송대학교 논문집 Vol.9 No.-
This study is purposed to analyze on the Knowledge-based Society and Transformation of Higher Education. Knowledge-based Society is a middle stairway society of Industrial Economy and Quantum Economy. A general concept of Knowledge is changed. A required field of Knowledge is changed. A Universal Knowledge and a Vocational Ability to demand for each person is changed. This changes requires necessarily a reformation on the Paradigm and Curriculum of Higher Education. A reformation of Curriculum is more important. A reformation to the Practical Curriculum and Interdisciplinary Curriculum is a core assignment.
운동전·후 淸暑益氣湯 투여방법이 2,000m 달리기시 선수들의 운동피로회복에 미치는 영향
유종만,이규성,강명신,오재근,최용어 韓國體育大學校附屬 體育科學硏究所 1994 韓國體育大學校附屬 體育科學硏究所論文集 Vol.13 No.1
The purpose of this study was to investigate the effects of two different chung-seo-ik-gi-tang administration types on fatigue induced during 2,000 m running in 12 healthy-male elite boxer. All subjects were divided randomly with two groups, Pre-administration Group(A: N=7) and Pre- and Post-administration Group(B: N=7) and performed 2,000 m maximal running. The blood samples were collected from antecubital vein by 10ml syranges(6ml/each) at before exercise, immediately after exhaustion, recover-10 min, recover-20 min and recover-30 min. These samples were used to analyze for the level of glucose, lactate, TG, LDH, pH, HCO₃?, Na??, K??. The statistically analyzed results of various blood parameters were summarized as follow, 1. Plasma glucose were not showed significant difference between two groups. but glucose lwvel at post-exercise and rest-30 min in B group wes significantly decreased. 2. Lactate accumulation in B group was significantly decreased at post-exercise and rest-30 min.. And lactate level at rest-30 min. was showed significant difference between two gruops. 3. Serum LDH response to 2,000 m running at post-exercise and recovary periods was showed significant changes in B group. 4. Venous pH at post-exercise, HCO₃? at post-exercise and rest-30 min. in A group and pH at post-exercise and rest-10, 20 min., HCO₃? at post-exercise were showed significant changes. But there were not showed significant difference between two groups. 5. K?? level in B group was showed significant difference compared to A group. And also K?? level at rest-30 min. in B group was showed significant change. The results indicated that Chung-seo-ik-pi-tang had the effects of ergogenic aids on fatigue and recovery during 2,000 m maximal running.
측두하악관절 내장증 환자의 자기공명영상에서 관절 원판의 전방 이동에 관한 연구
유하식,문창수,조병욱,이열,이용찬,이한욱 大韓顎顔面成形再建外科學會 1993 Maxillofacial Plastic Reconstructive Surgery Vol.15 No.3
Tempormandibular Joint pain and dysfunction is a common and important clinical problem. With the recent advances in imaging technology, radiologists have made major contribution to the understanding of TMJ disease. The MRI has several advantages over the conventional imaging methods. It is possible to obtain surprisingly precise images of internal hard and soft tissues with MRI. It is not invasive without ionizing radiation. The abnormal disk position has been thought as the cause of TMJ internal derangement. But there are few methods to relate disk position to TMJ internal derangement quantatively. The object of our study is to determine the amount of anterior displacement fo articular disk in symptomatic patients related each symptoms. Using the method of Dr. Drace, we studied the 38 joints of 22 persons with susceptable TMJ internal derangement. 1. In determining the anterior displacement of TMJ articular disk, the junction between the posterior band and bilaminar zone was useful. 2. The mean anterior displacement of disk in reduction group and without reduction gouop were 51.0 and 81.1 respectively. The difference was significant. 3. In the mean anterior displacement of disk, the pain without clicking group showed 84.8 and the clicking and pain group 70.8, the clicking group respectively.
유용덕,이창호,전윤수,이남규 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2
Posterial urethal valves represent the most common post-vesical obstructive malformation. One of the most credited pathological theories considers them an anomalous insertion of mesonephric duct into the cloca or incomplete involution of plicae colliculi. Urinary tract disorders that following posterior urethral valves include hydrouretheronephrosis and functional impairment of the entire urinary tract with consequent renal failure. Treatment of posterior urethral valves consists in their resection. In low-weight patients or in case of poor general condition, temporary external urinary bypass is feasible.