• Korean Journal of Mathematics
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• v.30 no.4
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• pp.643-652
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• 2022

In this paper, we will describe affine homogeneous domains in the complex plane. For this study, we deal with the Lie algebra of infinitesimal affine transformations, a structure of the hyperbolic metric involved with affine automorphisms. As a consequence, an affine homogeneous domain is affine equivalent to the complex plane, the punctured plane or the half plane.

• Bulletin of the Korean Mathematical Society
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• v.32 no.1
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• pp.115-121
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• 1995

We define a group of homogeneous type G which is a more general setting than $R^n$. This group G forms a natural habitat for extensions of many of the objects studied in Euclidean harmonic analysis.

• Korean Journal of Child Studies
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• v.27 no.3
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• pp.207-223
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• 2006

Classroom teachers measured children's social competence(SC). Thirty-two children were observed while they participated in cooperative art activities in homogeneous(high SC with high SC, or low SC with low SC) and heterogeneous(mixed SC) groups. Results showed that positive peer interaction was the most frequent type of interaction. Children with lower levels of social competence worked alone rather than in peer interaction. Children with higher levels of social competence showed more positive peer interaction. 'Imitating', a sub-item of dependent peer interaction, was most frequent in children with lower levels of social competence. Higher SC children maintained high SC regardless of grouping, but lower SC children showed significant differences in peer interaction between homogeneous and heterogeneous groups.

• Journal of Korean Home Economics Education Association
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• v.12 no.1
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• pp.47-58
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• 2000

The purpose of this study is to investigate the effects of cooperative learning method on student achievement and attitude in Home Economics. and that what sort of effectiveness be existed between the two groups. Homogeneous & Heterogeneous one in achievement. A junior middle school in Kwangju was served for the study. Setting two groups: One is for cooperative learning and other for traditional learning. Two classes were provided with cooperative learning method. while one class with traditional learning method. Two hours of a week were devoted for the experiment. and it was also planned to be lasted six weeks from the third of June. 1998. until the 13th of July. 1998. The results are as follows: 1) Student achievement from cooperative learning method showed a little higher than those from traditional learning method. 2) Cooperative learning method was more effective than traditional learning method. mental attitude toward school. lessons and teachers were more higher than those the traditional learning method. 3) The group of Heterogeneous members was higher than the group of Homogeneous members in their student achievement. 4) It is noticeable that two groups under cooperative learning method. however showed some difference when each of them is placed in different organization. The group of Heterogeneous members was more affirmative attitude toward school. lessons and teachers than the one Homogeneous members.

• Journal of Korean Neurosurgical Society
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• v.61 no.1
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• pp.97-104
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• 2018

Objective : Diffusion-weighted magnetic resonance imaging (DW-MRI) has proven useful in the study of the natural history of ischemic stroke. However, the potential of DW-MRI for the evaluation of chronic subdural hematoma (CSDH) has not been established. In this study, we investigated DW-MRI findings of CSDH and evaluated the impact of the image findings on postoperative outcomes of CSDH. Methods : We studied 131 CSDH patients who had undergone single burr hole drainage surgery. The images of the subdural hematomas on preoperative DW-MRI and computed tomography (CT) were divided into three groups based on their signal intensity and density : 1) homogeneous (iso or low) density on CT and homogeneous low signal intensity on DW-MRI; 2) homogeneous (iso or low) density on CT and mixed signal intensity on DW-MRI; and 3) heterogeneous density on CT and mixed signal intensity on DW-MRI. On the basis of postoperative CT, we also divided the patients into 3 groups of surgical outcomes according to residual hematoma and mass effect. Results : Analysis showed statistically significant differences in surgical (A to B : p<0.001, A to C : p<0.001, B to C : p=0.129) and functional (A to B : p=0.039, A to C : p<0.001, B to C : p=0.108) outcomes and treatment failure rates (A to B : p=0.037, A to C : p=0.03, B to C : p=1) between the study groups. In particular, group B and group C showed worse outcomes and higher treatment failure rates than group A. Conclusion : CSDH with homogeneous density on CT was characterized by signal intensity on DW-MRI. In CSDH patients, performing DW-MRI as well as CT helps to predict postoperative treatment failure or complications.

• Journal of the Korean Institute of Landscape Architecture
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• v.24 no.1
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• pp.32-41
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• 1996

This study examines the relationships between desired recreation experiences recreational context and environmental attributes that influence the choice of national park in which to recreate. Eight hundred and five visitors in three national park in which to recreate. Eight hundred and five visitors in three national parks were surveyed. Seven recreational experience domains and four homogeneous groups were identified. The contributions of environmental attributes homogeneous groups were identified. The contributions of environmental attributes to the choice of national park were found to differ among four groups, and across recreational context such as past experience, membership, and the length of visit. The implications for national park management were discussed.

• Bulletin of the Korean Mathematical Society
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• v.50 no.5
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• pp.1725-1736
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• 2013

In this paper, we compute the images of homotopy groups of various classical Lie groups under the homomorphisms induced by the natural projections from those groups to irreducible symmetric spaces of classical type. We identify that those computations are certain lower bounds of Gottlieb groups of irreducible symmetric spaces. We use the lower bounds to compute some Gottlieb groups.

• Kyungpook Mathematical Journal
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• v.34 no.2
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• pp.199-205
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• 1994

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.48 no.12
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• pp.1575-1579
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• 1999

Embedded processors often accommodate two instruction sets, a standard instruction set and a compressed instruction set. With the compressed instruction set, code size can be reduced while instruction count (and consequently execution time) can be increased. To achieve code size reduction without significant increase of execution time, this paper proposes a new compressed instruction set architecture, called TOE (Two Operations Execution). The proposed instruction set format includes the parallel bit that indicates an instruction can be executed simultaneously with the next instruction. To add the parallel bit, TOE instruction format reduces the destination register field. The reduction of the register field limits the number of registers that are accessible by an instruction. To overcome the limited accessibility of registers, TOE adapts non-homogeneous register partition in which registers are divided into multiple subsets, each of which are accessed by different groups of instructions. With non-homogeneous registers, each instruction can access only a limited number of registers, but an entire program can access all available registers. With efficient non-homogeneous register allocator, all registers can be used in a balanced manner. As a result, the increase of code size due to register spills is negligible. Experimental results show that more than 30% of TOE instructions can be executed in parallel without significant increase of code size when compared to existing Thumb instruction set.

• Journal of the Korean Mathematical Society
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• v.54 no.6
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• pp.1759-1786
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• 2017

We examine the moduli space of oriented locally homogeneous manifolds of Type ${\mathcal{A}}$ which have non-degenerate symmetric Ricci tensor both in the setting of manifolds with torsion and also in the torsion free setting where the dimension is at least 3. These exhibit phenomena that is very different than in the case of surfaces. In dimension 3, we determine all the possible symmetry groups in the torsion free setting.