• 소성∙가공
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• 제21권6호
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• pp.360-365
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• 2012

The aim of this study was to investigate the effects of forming depth on the deformation behavior of cup-like tubes made of AISI1020 steel in tube spinning process. Spinning process was performed on cup-like tubes, which had an inner diameter of 34mm and thicknesses of 7, 8.5 or 11.5mm. The forming depths achieved were 3, 4, and 5.5mm. The complex deformation behaviors occurring during the tube spinning process was explained using the experimental results. Also analyzed were the causes of the material buildup and the bulge defect of inner surface, observed on cross section of tubes. The relationship between tube spinning conditions and the height of bulge defect was examined. The results indicate that bulge defect is increased with a decrease of the forming depth. Moreover, a critical forming depth exists for preventing the generation of the bulge defect in the tube spinning process. The present results will be useful for future decisions of forming depths for successful tube spinning of cup-like tubes.

• 한국지능시스템학회논문지
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• 제26권5호
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• pp.390-395
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• 2016

본 논문에서는 인간의 스프린트 경기와 휴머노이드 로봇의 스프린트 경기를 비교하고 FIRA가 주관한 휴머노이드 로봇의 대표적인 스포츠 경기인 HuroCup에 대해서 소개한다. 또한 이 대회의 경기 규정을 알아보고 휴머노이드 로봇이 스프린트 경기를 수행하는데 사용할 수 있는 경기 전략을 제시한다. 본 논문을 위해 스프린트 경기 규정에 맞는 휴머노이드 로봇을 설계 및 개발하고, 제작한 휴머노이드 로봇에 스프린트 경기 전략 알고리즘을 적용하여 로봇의 성능을 시험한다. 마지막으로, 실제 경기 사례를 통해 제작된 휴머노이드 로봇이 스프린트 경기에 적합하게 수행함을 검증한다.

• 한국의류학회지
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• 제45권1호
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• pp.94-105
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• 2021

This study analyzes the shape change of the breast according to the replica combination method of the lower cup and suggest a pattern construction for the end use purpose. To provide appropriate brassiere patterns to each individual who has various 3D shape characteristics, the ways of layout of 3D replicas were investigated as well as evaluated subjectively and objectively. As for experimental brassieres, basic replicas from the mold cup of long-run brassiere were combined into five different ways to find the appropriate lower brassiere cup pattern. Eighteen women wore experimental brassieres and their breasts were analyzed using the Geomagic Design X program (3D System, Inc., Korea). As result, the pattern that matched the vertexes of the four pieces of the replica and naturally spread the bottom part was best for raising and pushing toward the inside breasts. The fit was good in the case of a pattern in which the convex portions overlapped both sides of the four replica pieces where the vertexes and the bottom part naturally spread apart. The subjects were able to differentiate comfortably fitted brassieres and highly functional brassieres.

• 한국의학물리학회지:의학물리
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• 제33권4호
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• pp.108-113
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• 2022

Purpose: Proton therapy has been used for optimal cancer treatment by adapting its Bragg-peak characteristics. Recently, a tissue-sparing effect was introduced in ultrahigh-dose-rate (FLASH) radiation; the high-energy transmission proton beam is considered in proton FLASH therapy. In measuring high-energy/ultrahigh-dose-rate proton beam, Faraday Cup is considered as a dose-rate-independent measurement device, which has been widely studied. In this paper, the feasibility of the simply designed Faraday Cup (Poor Man's Faraday Cup, PMFC) for transmission proton FLASH therapy is investigated. Methods: In general, Faraday cups were used in the measurement of charged particles. The simply designed Faraday Cup and Advanced Markus ion chamber were used for high-energy proton beam measurement in this study. Results: The PMFC shows an acceptable performance, including accuracy in general dosimetric tests. The PMFC has a linear response to the dose and dose rate. The proton fluence was decreased with the increase of depth until the depth was near the proton beam range. Regarding secondary particles backscatter from PMFC, the effect was negligible. Conclusions: In this study, we performed an experiment to investigate the feasibility of PMFC for measuring high-energy proton beams. The PMFC can be used as a beam stopper and secondary monitoring system for transmission proton beam FLASH therapy.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2021년도 학술발표회
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• pp.389-389
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• 2021

불투수면의 증가는 유량변화 및 지하수위와 기저유출의 감소로 이어질 수 있으며 기저유량의 감소는 건기 시 하천의 유량공급까지 영향을 줄 수 있다. 이런 이유로 기저유량에 대한 정확한 분석 및 검증은 반드시 필요하지만 지표수-지하수를 고려한 통합적 해석의 어려움과 기저유출 분석에 대한 불확실성 및 기술적 한계로 분석이 어려운 실정이다. 따라서 본 연구에서는 SWAT 해석을 통해 획득한 모의유량과 관측유량을 비교하여 R²값을 계산하였으며 SWAT-CUP을 이용하여 검보정을 실시한 후 기저유출량을 정량적으로 산정하고 비교하였다. 연구지역 모의기간은 실측 유량자료가 있는 4개년을 대상으로 모의 하였으며 SWAT-CUP을 이용한 검보정 시 모의 횟수는 연구자에 따라 다양한 기준을 제시하고 있지만 모의 시간 대비 최대 효율인 1,000회 수행하였다. 또한 관측유량에 대하여 SPE(Swat Parameter Estimator) 알고리즘으로 모의유량을 최적화하였다. 실측유량과 모의유량을 비교한 결과 SWAT 분석에 의한 R²값보다 SWAT-CUP을 이용하여 검보정을 수행한 R²값이 높게 나타나 검보정 효과를 확인하였다. 또한 검보정 전후에 대한 기저유량을 비교하기 위하여 SWAT Output Data를 이용하여 유역에 대한 지표수유출, 중간유출, 지하수유출 등을 추출하였다. 추출한 단위면적당 데이터를 단위환산을 통해 유출량으로 산정하였으며 검보전 전과 데이터를 비교하였다. 지표수-지하수를 고려한 통합적 해석의 어려움과 실측치의 부족, 분석에 대한 불확실성 등으로 기저유량에 대한 해석은 어렵지만 SWAT-CUP을 이용하여 검보정 및 불확실성 개선이 수행되면 좀더 정확한 유량을 계산할 수 있으며 이는 향후 연구지역 지표수-지하수 연계해석을 위한 기초자료로 활용될 수 있을 것으로 판단된다.

• 시큐리티연구
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• 제5호
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• pp.41-69
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• 2002

This work analyze the hitec-based arms systems which might raise the tentions by terrorism. Apparently they are largely dependent on the biochemicals, electronics, laser, and cybernetics. Also they draw an attention to us of a probability of various threats from the terrorists, or ill intending regimes to deter the 2002's World Cup, under the heading of 'New Centennial, Meeting, and Start Movement.' What follows is that this research strongly proposes that we should take prior safety actions for hosting the successful World Cup Match in Korea-Japan as well as maintain the national security for peace.

• 전산구조공학
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• 제8권4호
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• pp.17-23
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• 1995

Based on the present FEM study for negative Poisson's-ratio UHMWPE, the following conclusions seem expected. 1) Negative Poisson's-ratio UHMWPE transfers less stresses to the subchondral or peripheral iliac bone, compared to the conventional UHMWPE with Poission's-ratio. 2) Negative Poisson's-ratio cup reduces stresses in UHMWPE cup itself as well as metal backing, and subchondral bone. 3) The reduction in periacetabular mechanical stresses would significantly reduce the rate of fatigue failure and consequently reduce the incidence of aseptic loosening of the cup due to wear or bone resorption.

• 소성∙가공
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• 제8권5호
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• pp.449-453
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• 1999

Sheet metal forming process is a non-linearity problem which is affected by various process variables, such as geometric shape of punch and die, frictional characteristic, etc.. Therefore, the knowledge of the influence of the process variables is needed in the design of sheet metal working processes. In this paper, cylindrical cup drawing tests for blank holding force, punch speed and lubrication between sheet material and tool were carried out to investigate the influence upon sheet formability. Experimental results were discussed about the defects on the deformation behaviors during the forming process.

• 대한불안의학회지
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• 제12권2호
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• pp.103-112
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• 2016

Objective : This study was conducted to examine the reliability and validity of the Measure of Constructs Underlying Perfectionism-Korean version (M-CUP-K). Methods : Two hundred and six normal subjects completed a battery of measures including M-CUP-K, Frost Multidimensional Perfectionism Scale-Korean version (FMPS-K), and Beck Depression Inventory (BDI). Psychometric properties of the M-CUP-K were analyzed. Results : The principal component analysis for construct validity resulted in 56 items composed of 6 factors (factor 1 : Dissatisfaction-Reactivity to Mistakes; factor 2 : Order-Details and Checking ; factor 3 : Satisfaction ; factor 4 : High standards ; factor 5 : Perceived Pressure from Others-Perfectionism toward Others ; factor 6 : Black and White Thinking about Tasks and Activities), compared to the original version. The M-CUP-K total and subscale scores were more strongly correlated with those of the other perfectionism-specific measure, FMPS-K, with a correlation of 0.822 (convergent validity) than with those of the nonspecific depression measure (discriminant validity). The Cronbach's ${\alpha}$ value for internal consistency of M-CUP-K was in an excellent range (r=0.872-0.935). The test-retest reliability for external validity suggested a good temporal stability with a total score correlation of 0.827. Conclusion : This study revealed that the M-CUP-K has good reliability and validity. Therefore, the M-CUP-K can be used as a promising measure of perfectionism in Korea.

• 한국화재소방학회논문지
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• 제20권3호
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• pp.29-34
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• 2006

인화점과 연소점은 가연성 물질의 잠재적인 화재 및 폭발 위험성을 결정하는데 중요한 연소 특성치들이다. 인화점은 가연성 액체에서 발생한 증기가 공기와 혼합하여 가연성 혼합기체를 형성하여 인화할 수 있는 액체의 최저 온도로 정의 한다. 연소점(fire point)은 가연성 액체 표면에 시험염(pilot flame)을 접촉시켰을 때 5초간 발염연소를 지속하는 액체의 온도를 말한다. 인화점은 여러 문헌에서 소개가 되고 있지만, 연소점은 연소의 지속성(sustenance)을 나타내는 중요한 자료임에도 불구하고 관련 문헌은 소수에 불과하다. 본 연구에서는 산류에 대해 Pensky-Martens 밀폐식 장치(ASTM-D93)와 Tag 개방식 장치(ASTM D1310-86)를 이용하여 하부인화점 및 연소점을 측정하였고, 측정된 값은 화학양론계수의 1.11배를 근거로 예측 값과 비교하였고, 제시된 식은 실험값과 잘 일치하였다.