• 한국미생물·생명공학회지
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• 제49권4호
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• pp.478-484
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• 2021

Cellular resources including transcriptional and translational machineries in bacteria are limited, yet microorganisms depend upon them to maximize cellular fitness. Bacteria have evolved strategies for using resources economically. Regulatory networks for the gene expression system enable the cell to synthesize proteins only when necessary. At the same time, regulatory interactions enable the cell to limit losses when the system cannot make a cellular profit due to fake substrates. Also, the architecture of the gene expression flow can be advantageous for clustering functionally related products, thus resulting in effective interactions among molecules. In addition, cellular systems modulate the investment of proteomes, depending upon nutrient qualities, and fast-growing cells spend more resources on the synthesis of ribosomes, whereas nonribosomal proteins are synthesized in nutrient-limited conditions. A deeper understanding of cellular mechanisms underlying the optimal allocation of cellular resources can be used for biotechnological purposes, such as designing complex genetic circuits and constructing microbial cell factories.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 1996년도 춘계공동학술대회논문집; 공군사관학교, 청주; 26-27 Apr. 1996
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• pp.333-336
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• 1996

This paper is an exploratory study aimed at finding factors that influence the penetration of cellular mobile telecommunications which have seen rapid development since 1980s. The paper tries to find economy and policy variables to influence the penetration by means of the multiple regression analysis. This paper shows a model that explain the penetration ratio of cellular service. The model is based on data from 39 upper middle income and 39 high income countries. The result shows that GDP per capita and the service period of the cellular mobile telecommunication have influenced on the penetration ratio positively, and the tariff of the service negatively. But, it is the open area to study the impact of the telecommunications policy changes on penetration, and to set a model which could explain the nation-specific characteristics.

• 한국산학기술학회논문지
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• 제10권2호
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• pp.455-462
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• 2009

본 연구는 고령 세대들의 정보화 사회 적응과 관련하려, 정보 통신기기에 대한 기능 및 UI(User Interface)에 대한 사용 실태와 여러 문제점들을 추적하고 이런 문제점들이 어떠한 인구 통계학적 요인들과 상관이 있는지를 알아보고자 하였다. 206명의 피험자를 대상으로 '인터넷 이용 및 통신기기', '콘텐츠 수용성 평가', '기계적 기능 수용성 평가', '상품성 평가'의 네 가지의 큰 핵심개념을 정하고 이 구성 개념을 측정할 수 있는 하위 문항으로 설문지를 구성하여 조사하였다. 본 연구의 결과는 대부분의 노년층에서 핸드폰의 전화기능 외에 많은 기능들을 사용하지 않는 것으로 나타났으며, 기존의 휴대폰 사용 또한 전반적으로 불편함을 드러내었다. 그러나 문자 보내기나 사진 찍기 등 점점 많은 기능들이 노년층 중 비교적 젊은 층을 중심으로 확대되고 있음을 보여주었으며, 더 나아가 노년층 내의 문화적, 경제적 혹은 건강의 조건에 따라 다양한 콘텐츠 및 기능들이 다시 세분화되어 사용하고 있는 특징들을 보여주고 있다.

• Journal of Microbiology and Biotechnology
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• 제12권3호
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• pp.497-502
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• 2002

Thirty-nine strains of Leuconostocs found to be tolerant to $10\%$ or more garlic were selected for further identification, by comparing their whole-cell protein pattern, 16S rRNA gene (first 530 bases) sequence, cellular fatty acid composition, and carbon source metabolism. Two isolates were Identified as Leuconostoc mesenteroides and 32 others as Leuconostoc citreum. Five other strains belonging to a cluster could not be allocated to the existing species. 16S rRNA gene sequence and cellular fatty acid composition of the unidentified bacteria exhibited close similarity with Leuconostoc argentinum. The unidentified isolates were not allocated to L. argentinum, because they formed polysaccharide from sucrose, while L. argentinum strains do not. Leuconostocs tolerant to high concentration of garlic were found predominantly on garlic surface, an extreme environment which is unfit for most of other microorganisms.

• 아태비즈니스연구
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• 제2권1호
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• pp.23-48
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• 2011

Generally, higher brand equity ends up with higher market share and higher profitability. However, superior brand equity does not guarantee the success in the market. That is, consumer choice is closely related to brand equity but we need more than brand equity to explain this complex phenomenon. We adopt the customer equity concepts: value equity, brand equity, and retention equity. By incorporating value equity and retention equity into customer equity, it is possible to avoid the problems of using the brand equity only. In the paper, we apply this customer equity concepts to cellular phone and investigate the effects of antecedent variables such as exposure, knowledge, positive experience and negative experience on the components of customer equity. In addition, as surrogate measure of customer lifetime value, the weighted measure of purchase intention, consideration set inclusion, and next purchase is used as dependent variable. We estimate the effects of components of customer equity at the brand level and aggregate level using SURE model. Estimation results show that Apple has currently low market share but has high future potentials and Korean firms have currently high market share but has rather low future potentials.

• 마케팅과학연구
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• 제11권
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• pp.165-182
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• 2003

본 연구는 이동전화 사용시 소비자들이 느끼는 건강 그리고 경제적 측면의 위험인지 정도를 조사하였고, 이에 영향을 미치는 요인을 조사하였다. 또한, 이동전화 사용시 소비자들의 건강 그리고 경제적 측면의 위험인지 및 관련 변수들이 이동전화 사용 후 소비자 만족도에 미치는 영향을 조사하였다. 연구결과를 요약하여 살펴보면, 첫째, 이동전화 사용과 관련한 건강 그리고 경제적 차원의 위험인지는 결혼한 소비자에게 높았다. 소득수준이 높을 수록 경제적 위험인지는 적게 느끼는 것으로 나타났다. 둘째, 이동전화에 대한 경제적 위험인지 만이 소비자 만족도에 유의한 영향을 미칠 뿐, 건강에 대한 위험인지 수준은 이동전화 사용 후 소비자 만족도에 영향을 미치지 않는 것으로 나타났다. 셋째, 대체로, 객관적인 정보원천을 이용한 소비자, 이동전화 서비스 업체에 대한 신뢰도가 높은 경우, 이동전화 기능 및 서비스 사용방법에 대한 지식이 높을수록 이동전화 사용 후 소비자만족도가 높은 것으로 나타났다.

• 유통과학연구
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• 제20권10호
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• pp.1-9
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• 2022

Purpose: This study examines the economic and technical reasons for the uneven distribution of broadband internet services in Indonesia before and during the recession due to the C19 pandemic, and examines its effect on the country's economy. Research design, data and methodology: The research was designed by conducting an economic feasibility, which was verified through area observations and interviews with providers and their association, as well as the Regulator. Results: The results show that during the C19 pandemic, there has been an increase in the distribution of broadband internet services in Indonesia since there has been an increase in demand for cellular services and fixed services together. However, the increase in broadband internet service coverage is still not evenly distributed in the country and unable to boost the decline in Gross Domestic Product during the C19 pandemic. Conclusions: The increase in fixed broadband coverage by seventy percent is an indication for the state to make policies to encourage bundling techniques between operators with the aim of internet services being more evenly distributed throughout the country. Where, the influence of a more even distribution of broadband internet services in all countries is believed to be able to support the country's economy.

• Molecules and Cells
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• 제40권12호
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• pp.889-896
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• 2017

Nuclear bodies are subnuclear, spheroidal, and membraneless compartments that concentrate specific proteins and/or RNAs. They serve as sites of biogenesis, storage, and sequestration of specific RNAs, proteins, or ribonucleoprotein complexes. Recent studies reveal that a subset of nuclear bodies in various eukaryotic organisms is constructed using architectural long noncoding RNAs (arcRNAs). Here, we describe the unifying mechanistic principles of the construction and function of these bodies, especially focusing on liquid-liquid phase separation induced by architectural molecules that form multiple weakly adhesive interactions. We also discuss three possible advantages of using arcRNAs rather than architectural proteins to build the bodies: position-specificity, rapidity, and economy in sequestering nucleic acid-binding proteins. Moreover, we introduce two recently devised methods to discover novel arcRNA-constructed bodies; one that focuses on the RNase-sensitivity of these bodies, and another that focuses on "semi-extractability" of arcRNAs.

• 대한전자공학회논문지TC
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• 제37권2호
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• pp.32-45
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• 2000

본 논문에서는 CDMA 기지국에 선형 어레이 안테나를 적용하고자 할 경우, beamforming(BF) 성능과 관련된 두 가지 주요지표인 주 빔 폭의 좁은 정도를 지칭하는 direction selectivity와 사용자 신호의 방향추정 정확도가 BF의 SINR(Signal to interference and noise ratio) 성능에 미치는 영향과 이들 상호간의 관련성을 해석적으로 유도하였으며, 이를 수신 동작 시뮬레이션을 통하여 확인하였다. BF에 내포된 사용자 방향추정 기능과 간섭 사용자 신호 억제기능에 대하여 이들의 오차가 SINR에 미치는 영향을 구분하여 알아보기 위한 목적으로 방향추정 기능만을 포함한 steering BF 알고리즘과 간섭 사용자 전력을 최소화시키는 기능이 포함된 MVDR(Minimum variance distortionless response) BF 알고리즘을 대상으로 해석 및 동작 시뮬레이션을 수행하였다. 이 과정에 BF 알고리즘의 방향추정 기능에 직접적으로 오차를 유발하는 전파의 공간적 scattering 현상에 대한 모델을 새로이 제시하여 적용하도록 하였다. 본 연구의 결과, 종래의 군사적 목적의 BF와는 달리 셀룰러 CDMA 기지국에 array 안테나를 적용하고자 할 경우는 direction selectivity 및 사용자 방향추정 정확도를 향상시키고자 하는 것이 구현의 경제성 및 오차요인들에 대한 robustness 측면에서는 적합하지 않다는 것을 확인하였다. 이러한 특성은 BF 성능열화에는 크게 영향을 주지 않으면서 복잡도를 최소화하고 오차요인에 대한 robustness 특성을 갖는 경제적인 BF 알고리즘의 구현을 가능케 하여주는 중요한 사실이다. 이에 본 연구에서 제시한 해석의 결과는 셀룰러 CDMA기지국에 대한 BF 알고리즘 개발 및 적용의 설계지표로서 의미가 크다하겠다.

• 기술경영경제학회:학술대회논문집
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• 기술경영경제학회 1999년도 제16회 동계학술발표회 논문집
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• pp.63-81
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• 1999

The environment of Information and Telecommunication industry has rapidly changed. This is leading the growth of the world economy. Because of the characteristic of the information and communication, the standardization plays a important role in this market. The company that owns the standardization in its industry has dominant power like Microsoft in personal computer software, and Qualcomm in digital cellular phone system. Therefore, to take advantage of this standardization power, it is important to find which technology will be set up as a new standard. This paper presents how to capitalize the standardization as a market strategy. To perform this strategy, we take two steps. The first step is to strategically choose the most important technology or service which would lead the information and telecommunication market. We used modified AHP(Analytic Hierarchy Process) to set the priorities among the various standard related technologies and services, We interviewed with the information and telecommunication experts to find out some criteria and the weights of them. The second step is to select the standard to realize the technology. Actually, this is very hard to decide which technology we should select, because there are lots of alternative standards to develop the technology. In this step, we use a strategic framework for choosing the standard. This framework provides how the research institution and company do to get a maximum benefit from the standardization strategy, Finally, we applied these to Korea's situation simply in order to show how to take advantage of the framework.