• Ocean Systems Engineering
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• 제8권2호
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• pp.167-182
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• 2018

RTI (Rayleigh-Taylor instability) is investigated by a multi-liquid MPS (Moving Particle Semi-implicit) method for both viscous and inviscid flows for various density differences, initial-disturbance amplitudes, viscosities, and surface tensions. The MPS simulation can be continued up to the late stage of high nonlinearity with complicated patterns and its initial developments agree well with the linear theoretical results. According to the relevant linear theory, the difference between inviscid and viscous fluids is the rising velocity at which upward-mushroom-like RTI flow with vortex formation is generated. However, with the developed MPS program, significant differences in both growing patters and developing speeds are observed. Also, more dispersion can be observed in the inviscid case. With larger Atwood (AT) number, stronger RTI flows are developed earlier, as expected, with higher potential-energy differences. With larger initial disturbances, quite different patterns of RTI-development are observed compared to the small-initial-disturbance case. If AT number is small, the surface tension tends to delay and suppress the RTI development when it is sufficiently large. Interestingly, at high AT number, the RTI-suppressions by increased surface tension become less effective.

• 한국주거학회논문집
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• 제22권4호
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• pp.11-22
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• 2011

According to the changing environment of modern society, a resident of the symbols reflects the growing need for housing has risen. Recently the participation of women in Korea, increased divorce rates, diversification of types of jobs, personal life, due to the typically family-oriented values is not the type of atypical forms of various types of households (a person households, newlyweds, Late Marriage Couples, single parent households, cohabiting, single core, including a disclaimer) is formed, and this trend for the social composition of the new housing environment is required. In this study, South Korea, Japan, the two countries central to the values of personal life for the area be developed by the individual but in reality did not meet the residential space in the current "environmental action research" living life based on the construction of a personal area tend to be aware of. Central values of private life, which amplified the possibility of increased prices as the difficulties in living life the most "private area" Building "area of the discrepancies" and controlled through the building of the reason for the tendency of humans in the future by identifying Oriented for the formation of residential space is to provide basic information. In addition, changes in family patterns in Japan and South Korea ahead of the current family patterns by comparing the present and future of Korea is trying to think.

• Fisheries and Aquatic Sciences
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• 제21권8호
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• pp.28.1-28.12
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• 2018

Intertidal macroalgae are exposed to many abiotic stress factors, and they must regularly react to changes in their environment. We used RNA-seq to describe how Porphyra umbilicalis (Rhodophyta) changes gene expression patterns to interact with different habitats. Tissue samples were taken from a typical habitat along the open-coast of the Northwest Atlantic, as well as from a rare, atypical habitat in an estuarine tidal rapid environment. Differential gene expression analyses suggest that pathogic bacteria and viruses may be a significant factor influencing the transcriptome in the human-impacted estuarine environment, but the atypical habitat does not necessarily induce more stress in Porphyra umbilicalis growing there. We found genes related to nitrogen transport are over-expressed in tissue from the open-coastal site compared to those from the estuarine site, where environmental N levels approach hypertrophic levels. Low N levels impede growth, but high levels are toxic to cells, and we use qPCR to show this species regulates expression of a putative high-affinity $NH_4{^+}$ transporter under low and high N conditions. Differences in expression of this transporter in these habitats appear to be inherited from parent to offspring and have general implications for adaptation to habitat in other species that are capable of asexual reproduction, as well as more specific implications for this species' use in aquaculture.

• 한국식물병리학회지
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• 제14권5호
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• pp.536-542
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• 1998

Ten isolates of the orchid mycorrhizal fungi were isolated from the roots of Korean native orchid plants (Cymbidium goeringii) which inhabitate mainly in southern and western areas of Korea. The growth rates and color of the isolates in potato dextrose agar (PDA) were various. Microscopic observations of the hyphae isolated were identified as Rhizoctonia repens and R. endophytica var endophytica or their related species. R. repens was isolated from the roots of the Korean native orchids, but R. endophytica var endophyica was only isolated from the roots of the commercial orchids introduced from foreign countries. Also, the polymorephic patterns of genomic DNA extracted from selected isolates were compared with those of DNA extracted from the orchid mycorrhizal fungi isolated previously and similar band patterns were observed among those isolates. Five isolates of R. repens were selected and cultured at the oatmeal agar for investigating their symbiosis with orchid plants. The symbiotic specificity between orchid plants and isolated orchid mycorrhizal fungi was observe by growing orchids about six months in the greenhouse. The symbiotic responses of the commercial orchid plants with selected isolates were quite different form different isolates due to the genetic variations.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2005년도 춘계학술대회 논문집
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• pp.135-139
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• 2005

Thin films of $BaTiO_3$ system were prepared by radio frequency(rf)/dc magnetron sputtering method. We have investigated crystal structure, surface morphology and PTCR(positive-temperature coefficient of resistance) characteristics of the specimen depending on second heat-treatment temperatures. Second heat treatments of the specimen were performed in the temperature range of 400 to $1350^{\circ}C$. X-ray diffraction patterns of $BaTiO_3$ thin films show that the specimen heat treated below $600^{\circ}C$ is an amorphous phase and the one heat treated above $1100^{\circ}C$ forms a poly-crystallization. In the specimen heat-treated at $1300^{\circ}C$, a lattice constant ratio (c/a) was 1.188. Scanning electron microscope(SEM) image of $BaTiO_3$ thin films of the specimen heat treated in between 900 and $1100^{\circ}C}$ shows a grain growth. At $1100^{\circ}C$, the specimen stops grain-growing and becomes a poly-crystallization.

• ETRI Journal
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• 제43권2호
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• pp.246-259
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• 2021

Traditional wisdom on how late industrialized countries follow the technology trajectories of preceding economies is in need of reformation as these countries have attained industrial leadership in a growing number of fields. However, current understandings about these countries' development of their emerging technologies have yet to investigate the divergence of idiosyncratic technology trajectories. The aim of this paper was to explore how their knowledge production strategies in emerging technology sectors are diverging. Specifically, this research examines the changing patterns of knowledge production in quantum technology in South Korea and China by developing a knowledge portfolio and knowledge strategic diagram. According to the knowledge portfolio, the relative literature position differs. In the knowledge strategic diagram, there are diverging patterns in the emerging keywords sector. This paper contributes to the literature by demonstrating the diverging strategies of late industrialized countries in their transition from catch-up to post-catch-up paradigms and provides policy implications for countries developing an idiosyncratic trajectory in emerging technology sectors.

• 한국정보시스템학회지:정보시스템연구
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• 제29권4호
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• pp.1-24
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• 2020

Purpose An increase in the number of fitness apps across the world is a testament to the growing interest in health. As focus on medical services shifted from treatment to prevention, this type of app plays an essential role in promoting one's health and exercise management. Yet little has been known about practical effects of fitness apps in existing literature thus this study searches for factors that affect daily use of fitness apps and examine the relationship between app usage and exercise patterns. Design/methodology/approach This study surveyed people who used Cashwalk, the pedometer app for a minimum of a week to analyze reasons why they used the app. Particpants' exercise patterns were also recorded. By examining survey results of fitness app users and developing a research model based on the Customer Value Theory, this study provides real-life factors to the fitness and smart health care industry that will adopt a proactive lifestyle pattern. Findings Empirical analysis proved properties such as the complexity of fitness apps, monetary rewards, exercise monitoring and the enjoyment of using fitness apps contribute to using fitness apps on a daily basis. Furthermore, more daily use of fitness apps was shown to have a greater impact on exercise. This study also confirmed that social comparison does not affect the daily use of fitness apps and the amount of exercise, and the habitual walking was proved to directly affect the amount of exercise.

• 패션비즈니스
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• 제28권4호
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• pp.93-112
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• 2024

Despite a continuous decline in birth rate, children's clothing market is growing, driven by consumption trends of MZ generation parents who are willing to invest generously in their only child. Therefore, this study aimed to: 1) analyze changes in children's clothing market; 2) ascertain preferences and consumption patterns of MZ generation parents towards children's textile designs through surveys; and 3) develop textile designs targeting MZ generation parents based on these research findings. This study involved processes of literature review, market research, and design development. Survey results indicated that 'patterns and prints' were the most critical factor when purchasing children's clothing. The design process reflected survey and literature review findings, starting from idea conception to motif setting, pattern development, colorway, and simulation checks for final application suitability. Designs were executed using CAD programs centered around the main theme 'Enchanted Tea Party' and five sub-themes. This research was significant as it conducted surveys known to be challenging for corporations, thereby capturing the essence of MZ generation parents' preferences through the design process. This will provide essential information for establishing children's clothing design and marketing strategies, contributing to sustained growth of the market and enhancing the competitiveness of children's clothing brands.

• 한국식생활문화학회지
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• 제5권2호
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• pp.235-241
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• 1990

두릅나무 Aralia elata순의 saponin을 분리하여 조사한 결과는 다음과 같다. 1. Saponin의 함량과 종류는 자연산이 온상산보다 많고, 가열에 의해서는 모두 감소하였으며, 잎이 자랄수록 그 함량은 증가하였다. 자연산 날것 식용적기(Nr2)의 총 saponin 종류는 37개였다. 2. 자연산의 saponin 패턴은 생육시기에 따라 변하였으며 날것 식용적기(Nr2)가 다른 것에 비해서 크게 달랐다. 그러나 가열 처리한 결과는 saponin 패턴이 변화되어 시기적 차가 줄었다. 온상산은 자연산에 비해 피크가 단순하고 시기별 차이는 적었지만 가열에 의한 패턴의 차도 적었다. 3. 자연산 날것 식용적기는 ‘b’ saponin이 특이하게 많았고 나머지에서는 ‘d’ saponin이 가장 많았다.

• 한국지리정보학회지
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• 제9권1호
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• pp.116-126
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• 2006

본 연구는 도시성장에 관한 연구로써 부산시와 김해시 그리고 진해시의 도시성장과정을 분석하고 분석을 통하여 도시성장 패턴을 정립한다. 도시성장모델링을 통하여 각 지역의 조건에 따라 도시성장 형태와 패턴이 다르다는 것을 도출하고 이를 통하여 의사결정자들에게 공간계획시 활용할 수 있도록 한다. 연구방법으로는 퍼지-AHP와 셀룰라 오토마타를 도입하여 각 지역의 도시성장을 분석하였으며, 다양한 네이버후드와 전이규칙의 시뮬레이션을 통해 각 지역에 적합한 도시성장패턴을 도출하였다. 본 연구를 수행한 결과 부산지역 도시성장 패턴과 부산시 주변도시인 김해시와 진해시의 도시성장 패턴은 서로 다른 것으로 분석되어 각 지역적 조건에 따라 도시성장 패턴이 다른 것으로 도출되었다.