• 복식문화연구
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• 제29권4호
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• pp.522-537
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• 2021

The purpose of this study is to develop a knitwear design with the potential for practical use through a combination of science and design by examining the concept and formative characteristics of fractal geometry and applying them to the development of 3D virtual clothing knitwear design. This study produced five main conclusions. First, the sub-concepts of "Repeatability," "Scale variability," and "complexity," which are based on self-similarity, appear together with simple regularity in the fractal formative characteristics shown in fashion design. Second, fashion fields apply fractal geometry in three-dimensional surface textures and optical textile patterns as a method of expression. Third, it was confirmed that various expressions can be created with fractal patterns by using the SDS-ONE APEX 3-4 design system; moreover, fractal patterns are a suitable design source for the development of Jacquard knitwear patterns. Fourth, in the development of knitted jacquard fractal patterns, by arranging the patterns in perspective, the effect of emphasizing or reducing the human body by optical illusion was shown. Fifth, a knit Jacquard structure with a pattern that exhibits fractal modeling characteristics and applying it to a 3D virtual clothing sample design reduces the time required for sample production while expanding the knit design's expression area and reducing costs. Thus, the clothing sample confirmed the effectiveness of practical knitwear design development.

• The Journal of Asian Finance, Economics and Business
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• 제9권8호
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• pp.109-121
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• 2022

The study empirically examines the horizontal spillover effects of foreign direct investment (FDI) on the productivity of Indian pharmaceutical firms. Robust least squares and the Generalized Method of Moments estimators are applied for the firm-level panel data of Indian pharmaceutical companies whose shares were traded on the National Stock Exchange (NSE) and Bombay Stock Exchange (BSE). The information was collected from the Centre for Monitoring Indian Economy (CMIE) Prowess database from 2015 to 2019. Based on the regularity in data availability, the sample firms are limited to 112 companies, 100 of which are domestic firms and 12 international firms. Firms with more than 10 percent foreign equity are classified as FDI firms, while those with less than that are classified as domestic firms. Estimation results show that foreign ownership does not contribute to the productivity of domestic firms. Due to increased competition, the Indian pharmaceutical companies with foreign equity participation are not more productive than local ones. Moreover, the findings reveal a negative and insignificant horizontal spillover effect from FDI on the productivity of domestic enterprises. The absence of horizontal spillovers may be attributable to foreign enterprises' ability to prevent technological outflow to competitors in the same industry.

• Composites Research
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• 제36권5호
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• pp.349-354
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• 2023

Poly(3-hexylthiophene) (P3HT)는 유기 용매에서 높은 용해도를 가지고 있으면서 상대적으로 쉽게 구할 수 있는 공액 고분자 중 하나이다. 그러나, 전자소자의 활성 소재로써 전기적 특성은 실제로 응용하기에는 부족하므로 추가 개선이 필요하다. 본 연구에서는, 서로 다른 위치 규칙성 (regio-regularity)을 가지는 두 P3HT 고분자 (즉, regioregular (RR) P3HT 및 regio-random (RRa) P3HT)를 혼합하여 혼합 박막의 전하 전달 특성을 크게 향상시킬 수 있음을 보여준다. 두 P3HT 고분자 간 비율을 변화시킴으로써 혼합 박막의 구조적 및 전기적 특성을 체계적으로 조사하였으며, 원자 힘 현미경(AFM), X선 회절(XRD) 및 UV-vis 흡수분광법을 사용하여 혼합 필름의 구조 및 광전자적 특성을 평가하였다. 혼합 박막의 결정성은 RRa-P3HT 함량이 20 wt%로 증가함에 따라 증가하였으며, 이후 80%까지 증가함에 따라 감소하였다. 전하 이동도의 경향성 또한 이와 같았으며, 20 wt%의 RRa-P3HT를 포함하는 혼합 박막의 전하 이동도는 가장 높은 0.029 cm²/V·s로 측정되었고 함량이 80 wt%까지증가함에따라 0.0007 cm²/V·s 로감소하였다.

• 한국재료학회지
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• 제23권8호
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• pp.453-461
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• 2013

Controlling the stick and slip motions of the contact lines in a confined geometry comprised of a spherical lens with a flat substrate is useful for manufacturing polymer ring patterns. We used a sphere on a flat geometry, by which we could control the interfaces of the solution, vapor and substrate. By this method, hundreds of concentric ring-pattern formations of a linear conjugated polymer, poly [2-methoxy-5-(2-thylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), were generated with excellent regularity over large areas after complete solvent evaporation. Subsequently, the MEH-PPV ring patterns played a role as a directed template to organize highly regular concentric rings of single-walled carbon nanotubes(SWCNTs); when a droplet of the SWCNT suspension in water was casted onto the prepared substrate, hydrophobic polymer patterns confined the water dispersed SWCNTs in between the hydrophilicized $SiO_2/Si$ substrate. As the solvent evaporated, SWCNT-rings were formed in between MEH-PPV rings with controlled density. Finally, we used a lift-off process to produce SWCNT patterns by the removal of a sacrificial polymer template with organic solvent. We also fabricated a field effect transistor using self-assembled SWCNT networks on a $SiO_2/Si$ substrate.

• 스마트미디어저널
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• 제12권9호
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• pp.142-151
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• 2023

본 연구는 온·오프 강의에서 온라인으로 영어읽기 학습활동을 하는 학생들의 학습행태를 파악하는 사례 연구이다. 본 연구는 학기말에 실시한 설문조사와 학생들과의 전화 인터뷰를 토대로 하고 있다. 연구대상은 영어 듣기와 읽기 교과목을 수강하는 학생 77명이며 이중 5명과 전화로 인터뷰를 실시하였다. 연구결과 온라인 학습효과를 증진시키기 위하여 학습의 규칙성과 학습 순서는 개선할 필요성이 나타났으며 이를 위하여 교수자의 학생관리 방안이 제시되었다. 교수강의 시청의 경우 학생들은 일시정지와 반복시청과 같은 녹화강의의 장점을 잘 활용하고 있었으나 모든 학생들이 온라인 교수강의를 잘 이해할 수 있게 하기 위하여 녹화강의 개발에 대한 연구가 필요해 보였다. 대면 수업에서 실시하는 교수강의 복습퀴즈는 학생들이 교수강의를 더 적극적으로 시청하도록 자극을 주기 위한 것인데 연구결과 온라인 학습기간 설정과 퀴즈 문제 개수와 같은 요소들을 수정할 필요성이 나타났다.

• 융합정보논문지
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• 제10권1호
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• pp.128-138
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• 2020

본 연구의 목적은 취업모의 일·가정 양립이 배우자만족도에 미치는 영향 과정에서 사회적 지원의 매개효과를 검증하는 것이다. 이를 위해 한국아동패널조사 자료 중에서 10차년도(2017년)까지 표본이 유지된 취업모 727명을 대상으로 분석하였다. 자료분석은 빈도분석과 정규성 검증을 위한 기술통계를 실시하였으며, 상관분석과 위계적 회귀분석을 실행하였다. 또한 사회적 지원의 매개효과를 검증하기 위해 Baron & Kenny(1986)의 3단계 방법을 활용하였다. 검증결과는 다음과 같다. 첫째, 취업모의 일·가정 양립의 이점요인은 배우자만족도에 정적(+) 영향을 보였다(ß=.164, t=4.078, p<.01). 둘째, 취업모의 일·가정 양립의 갈등요인은 배우자만족도에 부적(-) 영향을 나타냈다(ß=-.134, t=-3.438, p<.05). 셋째, 취업모의 일·가정 양립의 이점요인과 갈등요인이 배우자만족도에 미치는 영향 과정에서 사회적 지원의 부분매개효과를 검증하였다. 이상의 연구결과를 바탕으로 취업모의 일·가정 양립이 배우자만족도와 사회적 지원을 높이기 위한 프로그램의 개발과 적용 방안을 제시하였다.

• 유통과학연구
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• 제11권5호
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• pp.63-76
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• 2013

Purpose - For the past several decades, behavioral economics or behavioral decision theory has undergone rapid development. This study provides a critical review of the development of behavioral economics with a focus on what are deemed to be core theories in the field. Starting from the utility function proposed by Daniel Bernoulli in the 18th century, the development history of utility functions until the emergence of the prospect theory is thoroughly reviewed. Some of the experimental results violating the traditionally assumed utility function and supporting the prospect theory value function are summarized. The most representative principles of rational choice are transitivity, independence from irrelevant alternatives (IIA), and regularity. The development of behavioral economics has been triggered by finding counter-examples to these principles. Some of the choice behaviors discussed in this study as counter-examples to the traditional theories of rational choice are the St. Petersburg paradox; the Allais paradox; gambling behavior; and the various context effects including the similarity effect, attraction effect, and the compromise effect. The Elimination-by-Aspects (EBA) model, which was proposed as an explanation for the similarity effect, is discussed in detail as well. Based on the literature review and further analysis, this study summarizes the relationship between the context effects, prospect theory, and EBA model. Research design, data, and methodology - This study provides an extensive literature review on several important theories in the field of behavioral decision theory and adds some critical comments to the theories and the relationships among them. This study first reviews the development of utility functions. Daniel Bernoulli introduced the concept of utility function to solve the St. Petersburg paradox. In the mid-20th century, Herbert Simon proposed the "satisficing" heuristic and presented a value function with a shape different from traditional utility functions. This study highlights the strengths and weaknesses of several utility functions proposed until the emergence of the prospect theory value function. Results - This study posits that prospect theory and EBA model are the two most important theories in the field of behavioral decision theory. They can explain various choice behaviors that traditional utility maximization analysis has been unable to. The application of these models to various fields is further increasing nowadays. This study explains how prospect theory and the EBA model can be used to explain the context effects. Conclusions - The traditional economic theory relies on a single variable called "utility" in explaining consumer choice. However, this study argues that, in investigating consumer choice, several other variables should also be considered. These are the similarity among alternatives, an alternative's prototypicality within the category, the dominance relationship between alternatives, and the reference point in evaluating alternatives. Due to the development of behavioral economics, we are now closer to a more complete understanding of consumer choice behavior than in the past when we had only a single tool called utility.

• 한국융합학회논문지
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• 제9권11호
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• pp.299-306
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• 2018

인구구조 및 경제적 상황의 변화는 기업의 전략이나 노동시장, 사회복지에 영향을 미치기 마련이다. 본 연구는 이러한 배경에서 공공재의 성격을 띠는 도서관 또한 예외는 아니라는 점을 주지하고 지역의 인구 및 경제적 상황의 변화가 도서관 이용에 미치는 영향을 확인하여 도서관 이용의 소득효과를 검증하는 것을 목적으로 한다. 본 연구의 목적을 달성하기 위해 2008년도부터 2017년까지 10년간의 공공도서관 통계 및 통계청의 인구총조사 자료 및 지역총생산, 실업률 자료를 활용하여 패널 고정효과 모형(Fixed effect model)으로 분석하였다. 분석결과 경제적 환경 변화는 도서관 방문자 수 및 자료실 이용자 수에 유의한 영향을 주지 않지만, 대출자 수에 중요한 영향 요인으로 나타났다. 본 연구는 경제적 환경 변화가 도서관에 어떠한 영향을 주고 있는지 밝혔다는 데에 의의가 있다. 향후 본 연구의 결과는 공공도서관의 서비스 정책 수립 시 지역, 시기에 따른 경제적 상황, 인구 구조를 반드시 파악해서 반영해야 하는 이론적 근거가 될 수 있을 것으로 기대한다.

• Toxicological Research
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• 제16권2호
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• pp.163-172
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• 2000

Recently, there is a worldwide concern that a great number of man-made chemicals have a hormone-like action both in humans and in animals. DECD is developing screening programs using validated test systems to determine whether certain substances may have an effect in humans. In the present study. the establishment oj repeated-dose toxicity test method was tried. Flutamide. an anti-androgenic agent. was administered by gavage to Sprague-Dawley rats for 28 days at dose levels of 0. 0.5. 3 and 18 mg/kg body weight (10-15 rats/sex/group) to examine the effects on general findings. especially reproductive and endocrine parameters. Clinical signs. body weights, food consumption, and sexual cycle were checked and measured. For the gross and microscopic examinations. 10 rats/sex/group were sacrificed at the end of dosing period and the remaining animals of control and high dose groups (5 each) were sacrificed after 14 days recovery. Examinations for hematology and clinical chemistry were carried out at necropsy. There were no treatment-related changes in clinical signs. body weights, food consumption. gross necropsy. hematology and clinical chemistry at all doses of both sexes. The period and regularity of sexual cycle were not adversely affected at all doses by the test agent. At 18 mg/kg. both decreased weights of prostate, seminal vesicle and epididymis in males and increased weights of spleen and thymus in females were observed. In addition, decreased number of spermatids and sperms. increased serum testosterone concentration and increased incidence (100%) of interstitial cell hyperplasia were seen in males. At 18 mg/kg of the recovery group. decreased prostate weight. reduced sperm count and increased incidence (20%) of interstitial cell hyperplasia in males and increased thymus weight in females were observed. At 3 mg/kg. reduced sperm count was found. There were no adverse effects on parameters examined at 0.5 mg/kg of both sexes. The results suggested that the potential target organs of flutamide may be accessory sexual glands including testes for males and spleen and thymus for females. Taken together. this test method was found to be a useful screening test system for endocrine disrupting chemicals.

• 한국컴퓨터정보학회논문지
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• 제25권1호
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• pp.131-140
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• 2020

본 연구는 소비자들의 개인품절반응지수(ISRI) 개발에 대한 연구로, 온라인 쇼핑 시 품절 상황에 대한 소비자들의 인지적 반응, 감정적 반응 및 행동적 반응의 영향을 분석하였다. ISRI는 선행연구인 Kim and Lee(2016/2018)의 인지, 감정 및 행동적 반응을 근거로 하여 개발하였다. 설문 조사는 인터넷 설문 조사 기관에서 2014년 07월에 2주간 진행되었으며 754명의 설문대상자 중 전체 질문에 응답한 회수된 설문지는 총 526부였다. 이 회수된 설문지를 본 연구의 조사에 이용하였다. 자료의 분석은 SPSS 25.0 Package를 이용하였다. 개인풉절반응지수(ISRI)는 정규분포를 형성하였다. 본 연구의 개인품절반응지수(ISRI)는 개인화, 맞춤화가 급속도로 진행되는 4차산업혁명 시대에 소비자의 불편한 쇼핑상황인 품절 시 대안의 마련 근거로써 실무적 의의를 가진다.