• 한국의상디자인학회지
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• 제22권3호
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• pp.49-61
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• 2020

This study analyzed the social media accounts and performed a Big Data analysis of Z-generation fashion using Textom Text Mining Techniques program and Ucinet Big Data analysis program. The research results are as follows: First, as a result of keyword analysis on 67.646 Z-generation fashion social media posts over the last 5 years, 220,211 keywords were extracted. Among them, 67 major keywords were selected based on the frequency of co-occurrence being greater than more than 250 times. As the top keywords appearing over 1000 times, were the most influential as the number of nodes connected to 'Z generation' (29595 times) are overwhelmingly, and was followed by 'millennials'(18536 times), 'fashion'(17836 times), and 'generation'(13055 times), 'brand'(8325 times) and 'trend'(7310 times) Second, as a result of the analysis of Network Degree Centrality between the key keywords for the Z-generation, the number of nodes connected to the "Z-generation" (29595 times) is overwhelmingly large. Next, many 'millennial'(18536 times), 'fashion'(17836 times), 'generation'(13055 times), 'brand'(8325 times), 'trend'(7310 times), etc. appear. These texts are considered to be important factors in exploring the reaction of social media to the Z-generation. Third, through the analysis of CONCOR, text with the structural equivalence between major keywords for Gen Z fashion was rearranged and clustered. In addition, four clusters were derived by grouping through network semantic network visualization. Group 1 is 54 texts, 'Diverse Characteristics of Z-Generation Fashion Consumers', Group 2 is 7 Texts, 'Z-Generation's teenagers Fashion Powers', Group 3 is 8 Texts, 'Z-Generation's Celebrity Fashions' Interest and Fashion', Group 4 named 'Gucci', the most popular luxury fashion of the Z-generation as one text.

• 비파괴검사학회지
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• 제33권2호
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• pp.181-186
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• 2013

가역투자율을 이용하여 차세대 에너지 설비 재료로 사용되는 첨단 페라이트강의 잔여수명을 비파괴적으로 평가하고자 하였다. 가역투자율 측정법은 가역투자율 값이 자기 히스테리시스 루프의 미분과 동일하다는 이론을 기반으로 하게 된다. 측정 원리는 한 가진진동수로 가변된 락-인 증폭기를 사용하여 탐지코일에 유도된 조화성분들의 진폭 값을 기본으로 한다. 가역투자율의 피크 간격, 비이커스 경도 그리고 인장강도는 시효된 샘플들에서 시효시간이 증가함에 따라서 감소하였다. 가역투자율의 피크 간격과 라손-밀러 파라미터의 관계를 통해 첨단 페라이트강의 잔여수명을 비파괴적으로 예측하는 것이 가능해진다.

• Structural Engineering and Mechanics
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• 제71권6호
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• pp.603-625
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• 2019

Main cable configurations under final dead load and in the unloaded state and critical construction parameters (e.g. unstrained cable length, unstrained hanger lengths, and pre-offsets for tower saddles and splay saddles) are the core considerations in the design and construction control of a suspension bridge. For the purpose of accurate calculations, it is necessary to take into account the effects of cable strands over the anchor spans, arc-shaped saddle top, and tower top pre-uplift. In this paper, a method for calculating the cable configuration under final dead load over a main span, two side spans, and two anchor spans, coordinates of tangent points, and unstrained cable length are firstly developed using conditions for mechanical equilibrium and geometric relationships. Hanger tensile forces and unstrained hanger lengths are calculated by iteratively solving the equations governing hanger tensile forces and the cable configuration, which gives careful consideration to the effect of hanger weight. Next, equations for calculating the cable configuration in the unloaded state and pre-offsets of saddles are derived from the cable configuration under final dead load and the conditions for unstrained cable length to be conserved. The equations for the main span, two side spans and two anchor spans are then solved simultaneously. In the proposed methods, coupled nonlinear equations are solved by turning them into an unconstrained optimization problem, making the procedure simplified. The feasibility and validity of the proposed methods are demonstrated through a numerical example.

• 정보교육학회논문지
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• 제24권6호
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• pp.615-622
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• 2020

본 논문에서는 2015 개정 교육과정에 따라 개발된 6종의 실과 교과서 중 '소프트웨어 교육' 단원의 탐구성을 분석하여 현장에서 이루어질 교과서 채택, 교육과정 연구, 차기 교과서 개발 시에 참고할 수 있는 시사점을 제공하였다. 선행 연구를 분석한 결과 초등학교 '소프트웨어 교육' 단원의 경우, 중·고등학교 교과서 연구에서 활발하게 진행되는 탐구성 분석이 미비한 것으로 파악되었다. 따라서 4차산업 혁명시대를 살아갈 우리 아이들에게 탐구형 교과서가 필요하다는 판단하에 Romey 분석법을 활용하여 교과서 내용을 분석하였다. 교과서를 분석한 결과, 모든 분석요소에서 탐구적 성향을 갖춘 이상적인 교과서는 없었으며, 교과서별로 탐구적 성향이 높은 분석요소가 다르게 나타났다. 전체 교과서에서 탐구적 성향이 가장 낮은 분석요소는 본문이였으며, 가장 높은 분석요소는 활동이었다. 교과서간 평가지수의 편차가 가장 큰 분석요소는 자료와 평가인 것으로 나타났다.

• 창의정보문화연구
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• 제7권1호
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• pp.21-29
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• 2021

본 논문에서는 2015 개정 교육과정에 따라 개발된 6종의 실과 교과서 중 '로봇 활용 교육' 단원의 탐구성을 Romey 분석법을 활용하여 현장에서 이루어질 교과서 채택, 교육과정 연구, 차기 교과서 개발 시에 참고할 수 있는 시사점을 제공하였다. 선행 연구를 분석한 결과 초등학교 '로봇 활용 교육' 단원의 경우, 중·고등학교 교과서 연구에서 활발하게 진행되는 탐구성 분석이 미비한 것으로 파악되었다. 따라서 4차산업 혁명시대를 살아갈 우리 아이들에게 탐구형 교과서가 필요하다는 판단 하에 Romey 분석법을 활용하여 교과서 내용을 분석하였다. 교과서를 분석한 결과, 모든 분석요소에서 탐구적 성향을 갖춘 이상적인 교과서는 없었으며 전체 교과서에서 탐구적 성향이 가장 낮은 분석요소는 본문이었으며, 가장 높은 분석요소는 활동이었다.

• 정보교육학회논문지
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• 제26권5호
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• pp.317-325
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• 2022

교과서에서 삽화는 개념을 쉽게 설명하고, 탐구과정을 안내하기 위해 사용된다. 따라서 삽화를 정확하고 이해하기 쉽게 제시해야 한다. 그런데 선행 연구를 분석한 결과 초등학교 '소프트웨어 교육' 단원의 경우, 삽화 분석과 관련된 연구가 전혀 없는 것으로 확인되었다. 이에 본 연구에서 2015 개정 교육과정에 따라 개발된 6종의 실과 교과서 중 '소프트웨어 교육' 단원의 삽화를 종류, 기능, 용도 측면에서 분석하여 현장에서 이루어질 교과서 채택, 교육과정 연구, 차기 교과서 개발 등에 참고할 수 있는 가이드라인을 제공하였다. 6종의 실과 교과서를 분석한 결과 모든 교과서가 페이지 당 1개 이상의 삽화를 사용하였고, 삽화의 종류는 화면캡쳐, 그림, 만화, 사진, 표, 도해 순, 삽화의 기능은 설명적 기능, 수행적 기능, 장식적 기능, 예시적 기능 순, 용도는 활동안내, 자료제공, 결과제시, 동기유발 순으로 활용되는 것으로 분석되었다.

• Asian-Australasian Journal of Animal Sciences
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• 제29권10호
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• pp.1371-1382
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• 2016

MicroRNAs (miRNAs) are short non-coding RNAs that post-transcriptionally regulate expression of mRNAs in many biological pathways. Liver plays an important role in the feed efficiency of animals and high and low efficient cattle demonstrated different gene expression profiles by microarray. Here we report comprehensive miRNAs profiles by next-gen deep sequencing in Angus cattle divergently selected for residual feed intake (RFI) and identify miRNAs related to feed efficiency in beef cattle. Two microRNA libraries were constructed from pooled RNA extracted from livers of low and high RFI cattle, and sequenced by Illumina genome analyser. In total, 23,628,103 high quality short sequence reads were obtained and more than half of these reads were matched to the bovine genome (UMD 3.1). We identified 305 known bovine miRNAs. Bta-miR-143, bta-miR-30, bta-miR-122, bta-miR-378, and bta-let-7 were the top five most abundant miRNAs families expressed in liver, representing more than 63% of expressed miRNAs. We also identified 52 homologous miRNAs and 10 novel putative bovine-specific miRNAs, based on precursor sequence and the secondary structure and utilizing the miRBase (v. 21). We compared the miRNAs profile between high and low RFI animals and ranked the most differentially expressed bovine known miRNAs. Bovine miR-143 was the most abundant miRNA in the bovine liver and comprised 20% of total expressed mapped miRNAs. The most highly expressed miRNA in liver of mice and humans, miR-122, was the third most abundant in our cattle liver samples. We also identified 10 putative novel bovine-specific miRNA candidates. Differentially expressed miRNAs between high and low RFI cattle were identified with 18 miRNAs being up-regulated and 7 other miRNAs down-regulated in low RFI cattle. Our study has identified comprehensive miRNAs expressed in bovine liver. Some of the expressed miRNAs are novel in cattle. The differentially expressed miRNAs between high and low RFI give some insights into liver miRNAs regulating physiological pathways underlying variation in this measure of feed efficiency in bovines.

• The Korean Journal of Physiology and Pharmacology
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• 제6권6호
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• pp.305-309
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• 2002

There are some evidences that $K^+$ efflux evoked by muscarinic stimulation is not mainly mediated by large conductance $K^+$ (BK) channels in salivary gland. In this experiment, we therefore characterised non BK channels in rat submandibular gland acinar cells and examined the possibility of agonist effect on this channel using a patch clamp technique. Two types of $K^+$ channels were observed in these cells. BK channels were observed in 3 cells from total 6 cells and its average conductance was $152{\pm}7$ pS (n=3). The conductance of the another types of $K^+$ channel was estimated as $71{\pm}7$ pS (n=6). On the basis of the conductance of this channel, we defined this channel as intermediate conductance $K^+$ (IK) channels, which were observed from all 6 cells we studied. When we increased $Ca^{2+}$ concentration of the bath solution in inside-out mode, the IK channel activity was greatly increased, suggesting this channel is $Ca^{2+}$ sensitive. We next examined the effect of carbachol (CCh) and isoproterenol on the activity of the IK channels. $10^{-5}$ M isoproterenol significantly increased the open probability (Po) from $0.08{\pm}0.02$ to $0.21{\pm}0.03$ (n=4, P<0.05). Application of $10^{-5}$ M CCh also increased Po from $0.048{\pm}0.03$ to $0.55{\pm}0.33$ (n=5, P<0.05) at the maximum channel activity. The degree of BK channel activation induced by the same concentration of CCh was lower than that of IK channels; Po value was $0.011{\pm}0.003$ and $0.027{\pm}0.005$ in control and during CCh stimulation (n=3), respectively. The result suggests that IK channels exist in salivary acinar cells and its channel activity is regulated by muscaricinic and ${\beta}-adrenergic$ agonist. We conclude that IK channels also play a putative role in secretion as well as the BK channels in rat submandibular gland acinar cells.

• The Korean Journal of Physiology and Pharmacology
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• 제8권6호
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• pp.335-338
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• 2004

There are numerous studies on transepithelial transports in duct cells including $Cl^-$ and/or $HCO_3^-$. However, studies on transepithelial $K^+$ transport of normal duct cells in exocrine glands are scarce. In the present study, we examined the characteristics of $K^+$ currents in single duct cells isolated from guinea pig pancreas, using a whole-cell patch clamp technique. Both $Cl^-$ and $K^+$ conductance were found with KCI rich pipette solutions. When the bath solution was changed to low $Cl^-$, reversal potentials shifted to the negative side, $-75{\pm}4\;mV$, suggesting that this current is dominantly selective to $K^+$. We then characterized this outward rectifying $K^+$ current and examined its $Ca^{2+}$ dependency. The $K^+$ currents were activated by intracellular $Ca^{2+}$. 100 nM or 500 nM $Ca^{2+}$ in pipette significantly (P<0.05) increased outward currents (currents were normalized, $76.8{\pm}7.9\;pA$, n=4 or $107.9{\pm}35.5\;pA$, n=6) at +100 mV membrane potential, compared to those with 0 nM $Ca^{2+}$ in pipette $(27.8{\pm}3.7\;pA,\;n=6)$. We next examined whether this $K^+$ current, recorded with 100 nM $Ca^{2+}$ in pipette, was inhibited by various inhibitors, including $Ba^{2+}$, TEA and iberiotoxin. The currents were inhibited by $40.4{\pm}%$ (n=3), $87.0{\pm}%$ (n=5) and $82.5{\pm}%$ (n=9) by 1 mM $Ba^{2+}$, 5 mM TEA and 100 nM iberiotoxin, respectively. Particularly, an almost complete inhibition of the current by 100 nM iberiotoxin further confirmed that this current was activated by intracellular $Ca^{2+}$. The $K^+$ current may play a role in secretory process, slnce recycling of $K^+$ is critical for the initiation and sustaining of $CI^-$ or $HCO_3^-$ secretion in these cells.

• 식물병연구
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• 제22권4호
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• pp.289-292
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• 2016

JYMV에 감염된 마는 잎과 엽맥에 부정형의 황화증상을 나타내었고, 마 주산단지인 경북 안동지역에서 조사한 결과 33.6%-40.8%의 감염률을 나타냈다. 마에 발생하는 JYMV 분리주 BRI 게놈의 polyprotein을 코딩하는 영역에 대한 염기서열을 결정하고 이를 JYMV isolate BRI로 명명하고 GenBank에 KU309315로 유전자 등록을 하였으며, 외피단백질 영역에 대한 유연관계 분석에서 대부분의 일본이나 중국과 분리주와는 다른 유연관계를 보이는데 이것은 분화 과정 중에 나타나는 변이주 가능성이 제시되나 추후 광범위한 조사를 통한 정밀한 분석이 필요하다.