• 응용통계연구
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• 제25권5호
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• pp.733-741
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• 2012

The successful launch of Arirang satellites allow the acquisition of high resolution satellite imagery of Korean territory and enables the transition from the conventional cultivation area survey method to new image based methods adopted in advanced nations. In this study, we suggested reasonable sizes of the primary sampling unit and the secondary sampling unit for the satellite imagery based sampling design in 8 provinces preselected for this research. The PSU size was determined mainly in consideration of intracorrelation that shows the degree of homogeneity within each cluster and the efficiency of the image process. For the SSU size, we considered the relative standard error and the differences between the land cover maps produced by the Ministry of Environment and the satellite imagery processed by the National Statistical Office.

• 아동학회지
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• 제26권1호
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• pp.347-357
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• 2005

The purpose of this study was to investigate the effect of the Nature-friendly program on children's Emotional Intelligence. The subjects of this study were two groups( experimental group and non experimental group). Each group consists of 30(8 years olds) elementary school children in Seoul. Examination of Emotional Intelligence was applied to determine the homogeneity of 2 groups. Experimental group received 10 Nature-friendly programs for 15 weeks from July 2004 to October 2004. After Nature-friendly programs ended, post examination of Emotional Intelligence was applied. The result of this research was as follow. When Nature-friendly programs was applied, there were significant differences in the degree of emotional intelligence in the experimental group. Children who were involved in nature-friendly program increased in emotional intelligence. Nature-friendly program was effective in the sub-factors of self-awareness, self-regulation, other-awareness, other-regulation of emotional intelligence.

• 한국세라믹학회지
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• 제30권9호
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• pp.723-730
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• 1993

The mechanism of formation of perovskite phase and the dielectric properties of PZMN[Pb(Zn, Mg)1/3Nb2/3O3] ceramics were examined using two different types of the columbite precursors, (Mg, Zn)Nb2O6 (MZN) and MgNb2O6＋ZnNb2O6 (MN＋ZN). The formatin of perovskite phase in PbO＋MN＋ZN system is characterized by an initial rapid formation of Mg-rich perovskite phase, followed by a sluggish formation of Zn-rich perovskite phase. On the other hand, thepyrochlore/perovskite transformation in the PbO＋MZN system proceeded uniformly with a spatial homogeneity. The degree of diffuseness of the rhombohedral/cubic phase transitionis higher in the PbO＋MN＋ZN system than in the PbO＋MZN specimen, indicating a broadened compositional distributjion of the B-site catons (Nb+5, Zn+2, Mg+2) in the PbO＋MN＋ZN system.

• Journal of Korean Biological Nursing Science
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• 제18권3호
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• pp.185-191
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• 2016

Purpose: The purpose of this study is to understand the effect of taking calcium/vitamin D supplements and performing Taekkyeon exercises on the frailty of the elderly targeting a vulnerable senior social group. Methods: A total of 124 people aged 65 and older consisting of 60 persons in the experimental group, and 64 persons in the control group participated in this study, and this study is a non-equivalent control group pre/post-test design quasi-experimental study. This study analyzed the homogeneity between the experimental group and the control group using a chi-square test and t-test while analyzing the difference in the degree of frailty and bone density with the practice of Taekkyeon and a calcium agent using t-test and GEE. Results: The study results showed that the frailty and bone density of the experimental group significantly improved. Conclusion: Through this study, it was confirmed that calcium/vitamin D intake and Taekkyeon exercises were an effective intervention which strengthened the elderly's physical condition.

• 소성∙가공
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• 제13권2호
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• pp.148-153
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• 2004

Finite element analysis of open die forging process to make rectangular billet has been performed in this study. Three dimensional rigid-plastic finite element method was used to analyze the effects of process variables, forging pass design and die configurations on the void closure phenomena to maximize the internal deformation for better structural homogeneity and center-line consolidation of the rectangular billet. The effect of anvil width ratio, anvil pitch, anvil shape and number of pass has been estimated by the degree of void closure ratio. Although it is difficult to optimize process parameters in the operational environments, favourable process conditions are suggested for better product quality.

• 농촌계획
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• 제4권1호
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• pp.15-21
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• 1998

The purpose of the study is to identify a basic spatial unit for rural village redevelopment plan. An ideal spatial unit need to satisfy three basic premises: to be homogeneous as rural community, to be appropriate to implement the project, and to be compatible with regional planning systems. A spatial unit could, empirically, be defined based on the homogeneity at first, and then appropriateness and compatibility could be used to adjust its boundary. Mitan-Myun(13 villages), Pyungchang County, Dochuck-Myun(15 villages), Kwangju County, and Chuksan-Myun(28 villages), Kimje City in Korea were selected as case study areas. The degree of interrelationship between all possible pairs in each Myun was measured using spatial, socio-cultural, and economic indicators. Multidimensional Scaling(MDS) was used to identify a homogeneous spatial unit, and then indicators representing appropriateness and compatibility were used to adjust the identified boundary. New districts which have two or three villages were suggested as a reasonable spatial unit for rural village redevelopment, and its boundary roughly overlaps with Bup-Jeong-Ri(法定里: a legally defined village).

• 대한금속재료학회지
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• 제49권6호
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• pp.474-487
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• 2011

Bars of OFHC Cu with the diameter of 45 mm were processed by equal channel angular pressing up to 16 passes via route $B_c$, and homogeneity of their microstructures and mechanical properties was examined at every four passes which develop the equiaxed ultrafine grains. In general, overall hardness, yield strength and tensile strength increased by 3, 7, and 2 times respectively compared with those of unECAPed sample. Cross-sectional hardness exhibited a concentric distribution. Hardness was the highest at the center of bar and it decreased gradually from center to surface. After 16 passes, overall hardness decreased due to recovery and partial recrystallization. Regardless of the number of passage, yield strength and tensile strength were quite uniform at all positions, but elongation showed some degree of scattering. At 4 passes, coarse and ultrafine grains coexisted at all positions. After 4 passes, uniform equiaxed ultrafine grains were obtained at the center, while uniform elongated ultrafine grains were manifested at the upper half position. At the lower half position, grains were equiaxed but its size were inhomogeneous. It was found that inhomogeneity of grain morphology and grain size distribution at different positions are to be attributed to scattering in elongation but they did not affect strength. The present results reveal the high potential of practical application of equal channel angular pressing on fabrication of large-sized ultrafine grained bars with quite homogeneous mechanical properties.

• 한국콘텐츠학회논문지
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• 제3권1호
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• pp.58-63
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• 2003

동영상에서의 물체추적은 각 프레임간의 시공간적 정보의 대응성을 추적함으로써 이루어질 수 있다. 시공간적 대응성을 결정함에 있어 각 프레임의 color invariant 속성을 이용하여 각 프레임의 물체 위치를 예측하고, 추출된 물체 블록의 누적 유사도 변환을 적용한 수치를 이용하여 프레임간의 물체 대응성을 결정함으로써 물체를 추적하는 방법론을 제시한다. 실험결과를 통하여 이러한 방법의 적용 적절성을 검증하였다.

• 대한기계학회논문집A
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• 제38권8호
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• pp.849-855
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• 2014

유리섬유강화 플라스틱 복합재료의 압축성형 시, 모재와 유리섬유의 분리 없이 유동성이 우수하고, 불균질한 섬유배향이 없는 GFRP 복합재료 개발에 관한 체계적인 연구결과는 미흡한 실정이다. GFRP 복합재료를 사용하여, 자동차 부품 성형 시 발생하는 불균질도와 섬유배향 발생을 억제하는 많은 연구를 해왔으나 아직 해결되고 있지 않다. 본 연구에서는 위의 문제점들을 해결하기 위해 섬유유동성이 뛰어나고, 섬유배향이 발생하지 않고, 불균질성이 없으며, 구조안정성, 함침도, 기계적 특성 및 재활용성 등이 우수한 유리섬유강화 플라스틱 프리프레그를 제조하여, 수직교차형 평직직조방법을 적용하여, GFRP(Glass Fiber Reinforced Plastic) Sheet 를 제조한다.

• Journal of Yeungnam Medical Science
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• 제27권2호
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• pp.105-112
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• 2010

병리조직학적으로 고환림프종으로 확진된 예들의 초음파검사 및 자기공명영상을 후향적으로 분석하여 다른 고환종양과 구분할 수 있는 소견이 있는지를 알아보기 위하여 본 연구를 시행하였다. 수술적 절제에 의해 확진된 7예와 초음파-유도하 조직생검으로 확진된 1예 등 총 8예를 대상으로 하였다. 종괴의 크기와 위치, 고환 이외에 침범된 장기를 조사하였고, 초음파검사에서는 종괴의 모양과 경계, 종괴 내부의 에코, 균일도와 함께 색도플러검사에서의 혈관분포상태를 조사하였다. 자기공명영상이 시행된 4예를 대상으로 종괴의 모양과 경계, 균일도, T1-및 T2-강조영상에서의 신호강도 및 조영증강 여부와 시간에 따른 조영증강의 변화를 조사하였다. 고환에 국한되어 있었던 경우는 2예에 불과하였고, 4예는 정삭을, 4예는 대동맥주위림프절을 침범하고 있었다. 초음파검사에서 종양의 외연은 6예에서 평활하였고 종괴의 에코는 7예에서 정상 고환 보다 저에코로 보였다. 4예는 균일하였고, 3예는 전반적으로는 균일하였으나 약간 불균일한 부분을 포함하고 있었고, 1예는 불균일하였다. 8예 모두에서 주변의 정상 조직보다는 현저하게 혈관분포상태 (vascularity)가 증가되어 있었다. 자기공명영상 T1-강조영상에서는 정상 고환과 유사한 신호강도로, T2-강조영상에서는 현저한 저신호강도로 관찰되었고 대체로 균일하였다. 조영 후 검사에서는 4예 모두 정상 고환 조직보다는 저신호강도로, 약하게, 균일하게 조영증강되었는데, 역동적 조영증강 검사가 시행된 1예에서는 시간이 감에 따라 점차 조영증강이 증가되는 소견을 관찰할 수 있었다. 이상의 결과를 토대로 50세 이상의 나이가 많은 환자에서 고환 종괴가 관찰되고, 초음파 검사에서 균일한 저에코로, 자기공명영상 T2-강조영상에서 균일한 저신호강도로 관찰될 때에는 고환림프종의 가능성을 가장 먼저 고려하여야할 것으로 생각한다.