• Child Studies in Asia-Pacific Contexts
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• 제5권2호
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• pp.83-94
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• 2015

The purpose of this study was to understand the influence of personality trait information on young children's perception of initial attraction in peer relationships. The sample consisted of 90 children of three to five years of age in South Korea. Children were presented with an inductive inference task where they had to make inference of a target character's preference on novel-play and prosocial act based on trait labels (smart-not smart, outgoing-shy, nice-mean) and perceptual (toy) similarity information of two test characters. Children showed difference in their use of trait information depending on the perceptual similarity information, trait valence, and inference question with age. This result provides initial support that not only do young children understand the significance of trait in peer attraction but also know when trait label is more informative to use to infer others depending on the situation.

• 대한수학회보
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• 제46권6호
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• pp.1237-1248
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• 2009

The domain of attraction of a nonlinear differential equations is the region of initial points of solution tending to the equilibrium points of the systems as the time going. Determining the domain of attraction is one of the most important problems to investigate nonlinear dynamical systems. In this article, we first present two algorithms to determine the domain of attraction by using the moment matrices. In addition, as an application we consider a class of SIRS infection model and discuss asymptotical stability by Lyapunov method, and also estimate the domain of attraction by using the algorithms.

• 한국콘텐츠학회논문지
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• 제21권9호
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• pp.570-579
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• 2021

여성은 남성에 비해 자본조달에 어려움을 경험하고 있으며, 이는 여성창업가의 성공을 저해하는 요인으로 작용할 수 있다. 이에 본 연구는 창업초기 기업의 투자유치성과에 있어 성별 간 차이를 확인하고, 성별 간 초기 투자유치성과에 영향을 미치는 조직 특성과 창업가 특성에 차이가 존재하는지 검증한다. 수도권 소재 기술기반 창업 기업을 대상으로 한 설문조사를 통해 자료가 수집되었으며, 총 287개의 기업이 분석에 활용되었다. 연구결과, 창업초기 기업의 투자유치성과는 성별 간 유의한 차이가 있는 것으로 확인되었다. 또한 분할그룹 회귀 분석 결과, 남성의 경우 기업연령, 기업규모, 초기자기자본금, 엔지니어 전공 등이 창업초기 기업의 투자유치성과에 유의한 영향을 미치는 것으로 확인된 반면, 여성은 모든 기업 및 창업가 특성 관련 세부 변수들의 영향력이 유의하지 않은 것으로 나타났다. 본 연구결과는 성역할 고정 관념과 같은 편견이 실제로 투자 유치활동과 관련된 경제 활동에 영향을 미친다는 것을 간접적으로 시사한다.

• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제11권2호
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• pp.41-47
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• 2007

A fine segmentation algorithm is proposed for extracting objects in an image, which have both weak boundaries and highly non-convex shapes. The image has simple background colors or simple object colors. Two concepts, geometric attraction-driven flow (GADF) and edge-regions are combined to detect boundaries of objects in a sub-pixel resolution. The main strategy to segment the boundaries is to construct initial curves close to objects by using edge-regions and then to make a curve evolution in GADF. Since the initial curves are close to objects regardless of shapes, highly non-convex shapes are easily detected and dependence on initial curves in boundary-based segmentation algorithms is naturally removed. Weak boundaries are also detected because the orientation of GADF is obtained regardless of the strength of boundaries. For a fine segmentation, we additionally propose a local region competition algorithm to detect perceptible boundaries which are used for the extraction of objects without visual loss of detailed shapes. We have successfully accomplished the fine segmentation of objects from images taken in the studio and aphids from images of soybean leaves.

• 현장농수산연구지
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• 제22권2호
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• pp.123-133
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• 2020

시설 재배지 내 담배가루이의 밀도 예찰을 위하여 여러 종류의 LED등(청색등, 녹색등, 적색등, 백색등)에 대한 유인력을 평가하였다. 유인력 평가는 황색끈끈이트랩에 부착된 담배가루이의 포집 수를 대상으로 하였다. 평가용 케이지 내에서 기주식물이 없는 조건에서 유인력은 청색등(107.3±2.5마리) > 백색등(83.0±12.1마리) > 적색등(58±21.8마리) > 녹색등(39.7±8.1마리) 순서로 나타났다. 먹이를 주입한 상태에서 유인력은 청색등(52±17.4) > 적색등(38.7±5.8) > 녹색등(12.7±1.5) > 백색등(11.7±5.0) 순서로 관찰되었다. 두 실험 조건에서 모두 청색등에서 유인력이 가장 높은 것으로 나타났다. 기주식물을 넣었을 때 LED등 유인력이 감소하는 것을 확인하였는데, 백색등(85.9%) > 녹색등(68.1%) > 청색등(51.6%) > 적색등(33.3%) 순서로 나타나 기주식물이 LED 등 유인력 감소에 영향이 있음을 확인하였다. 상대적인 방제력 평가에서는 기주식물을 처리한 6시간 이후에 적색등(66.7%) > 청색등(48.5%) > 녹색등(31.9%) > 백색등(14.1%) 순으로 높았다(F_3,8 = 14.7, P = 0.001). 따라서 청색등은 초기 유인력이 매우 높은 특징을 보였고, 적색등은 기주식물의 투입에 영향을 받지 않아 담배가루이 유인에 적합성이 있음을 확인하였다. 야외 실증실험에서는 낮은 온도조건에 의해 높은 유인력은 관찰되지 않았지만, 청색등과 적색등에서 대조구 대비 높은 유인력이 관찰되었다. 향후 적색과 청색을 활용한 LED등은 시설재배지 내 담배가루이의 예찰에 활용할 수 있을 것으로 기대된다.

• Fibers and Polymers
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• 제5권4호
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• pp.280-288
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• 2004

Split-type nylon/polyester microfiber and polyester microfiber fabrics possess drapeability, softness, bulkiness, and smoothness, so that they can be applied in various industrial fields. In particular, these fabrics are able to absorb various organic solvents, and can be used as clean room materials. To investigate the chemical affinity between solvents and the compositional materials of these fabrics, the contact angle of thermally pressed film fabrics was measured with different solvents. The thermally pressed nylon/polyester fabric films showed a chemical attraction to formamide. The sorption properties of the microfiber fabrics were investigated using a real time testing device, and these tests showed that the sorption behavior was more influenced by the structure of the fibrous assembly than by any chemical attraction. The effect of the fabric density, specific weight, and sample structure on the sorption capacity and rate was examined for various organic solvents. The sorption capacity was influenced by the density and the specific weight of the fibrous assembly, and knitted fabric showed a higher sorption capacity than woven fabric. However, the sorption rate was less affected in lower viscosity solvents. On applying Poiseuille's Law, the lower viscosity solvents showed higher initial sorption rates, and more easily penetrated into the fibrous assembly.

• 한국게임학회 논문지
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• 제12권2호
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• pp.75-89
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• 2012

본 논문은 대인관계 형성과 발달에 근본적인 목적을 두고 있는 SNS 관련 서비스에서 효율적으로 온라인 기반 대인관계를 발달시키기 위한 단서를 찾기 위해, 대인관계의 발달 단계에 따라 관계에 영향을 미치는 요인의 상관관계를 연구하였다. SNS를 통해 '온라인 기반 생성 관계'를 경험해본 사람들을 관계 발달 정도에 따라 두 가지 집단으로 구분하여 설문조사를 하였고, PLS 통계법을 이용하여 결과값을 도출하였다. 연구 결과, 초기 관계에서는 사회적 매력, 육체적 매력, 호혜성, 컨텐츠 퀄리티, 공동공간감, 정보 게시성과 유사성 등 7가지 요인이 대인관계에 영향을 미쳤다. 그리고 발달된 관계에서는 사회적 매력, 육체적 매력, 호혜성, 컨텐츠 퀄리티, 웹외양과 공동공간감 등 6가지 요인이 대인관계에 영향을 미쳤다. 본 연구는 온라인 대인관계 발달의 특성을 통해 SNS 관련 서비스에 대인관계 촉진을 위한 서비스 설계의 기반 연구로 활용 될 수 있을 것이다.

• 한국염색가공학회지
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• 제6권4호
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• pp.46-53
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• 1994

Polymer cationic agent was prepared by the initial polymerisation of epichlorohydrin followed by amination with diethylamine. Cotton fibre treated with the polymer (6~8% o.w.f.) is highly cationic and exhibit increased substantivity for reactive dyes under neutral to weakly acid conditions. The modified substrate could be dyed with reactive dyes without salt or a little salt from dye bath. The increased concentration of cationic agents resulted in an increase the colour yield. Futhermore, treated cotton has an electropositive surface charge. Adsorption of Reactive dye can be attributed to both van der waals force and electrostatic attraction.

• 한국염색가공학회지
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• 제7권2호
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• pp.1-8
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• 1995

Polymer cationic agent was prepared by the initial polymerization of epichlorohydrin followed by amination with diethyl-amine. Cotton fibre treated with the polymer (6∼8% o.w.f.) is highly cationic and exhibit increased substantivity for anionic dyes. The modified substrate could be dyed with direct dyes without salt or a little salt from dye bath. The increased concentration of cationic agents resulted in an increase the colour yield. Futhermore, treated cotton has an electropositive surface charge. Adsorption of direct dye can be attributed to both van der waals force and electrostatic attraction.

• 대한전기학회논문지
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• 제45권3호
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• pp.407-414
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• 1996

In this paper we consider the variable structure control for a class of discrete-time uncertain multivariable systems where the nominal system is linear. Discrete-time switching dynamics are introduced so that a new type of state trajectories called sliding mode may exist on the sliding surface by state feedback. The quantitative analysis for the matched uncertainties will show that every response of the system with the proposed switching dynamics is bounded within small neighborhoods of the state-space origin. Also, by the similarity transformation it will be shown that the eigenvalues of the closed-loop systems are composed of those of the subsystems which govern the range-space dynamics and null-space dynamics. It will be also shown that ideal sliding mode can be obtained in the absence of uncertainties due to one-step attraction to the sliding surface regardless of initial position of states. (author). 12 refs., 2 figs.